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EMULATION  OF  THE  AN/UYK-7 
TACTICAL  DATA  COMPUTER  ON  THE 
BURROUGHS  D-MACHINE 


Jerry  Michael  Haggerty 


"""mm*** 


NAVAL  POSTGRADUATE  SCHOOL 

Monterey,  California 


THESIS 

EMULATION  OF  THE  AN/UYK-7 
TACTICAL  DATA  COMPUTER  ON  THE 
BURROUGH'S  D-MACHINE 

by 

Jerry  Michael  Haggerty 

and 
John  Michael  Hartling 

December  1976 

Thesis  Advisor:                  S.  Jauregui 

Approved  for  public  release;  distribution  unlimited. 


7^333 


SECURITY  CLASSIFICATION  OF  THIS  RACE  (Whmn  Dmtm  Kntormd) 

~~~        REPORT  DOCUMENTATION  PAGE 


READ  INSTRUCTIONS 
BEFORE  COMPLETING  FORM 


1.    REPORT  NUMBER 


2.  OOVT  ACCESSION  NO, 


3.     RECIPIENT'S  CATALOG  NUMBER 


4.     TITLE  (mnd  Submit) 


Emulation  of  the  AN/UYK-7  Tactical 
Data  Computer  on  the  Burrough's 
D-Machine 


S.     TYRE  OF  REPORT  *  PERIOD  COVERED 

Master's  Thesis; 
December  1976 


«   PERFORMING  ORG.  REPORT  NUMBER 


7.     AUTHOR!"*; 


•.    CONTRACT  OR  GRANT  NL-MBERfa) 


Jerry  Michael  Haggerty  and 
John  Michael  Hartling 


9.     PERFORMING  ORGANIZATION  NAME  AND  ADDRESS 

Naval  Postgraduate  School 
Monterey,  CA   9  3940 


10.    PROGRAM  ELEMENT.  PROJECT,  TASK 
AREA  4  WORK  UNIT  NUMBERS 


II.     CONTROLLING  OFFICE  NAME  AND  ADDRESS 

Naval  Postgraduate  School 
Monterey,  CA  93940 


12.     REPORT  DATE 

December   19  76 


13.     NUMBER  OF  PAGES 
179 


14.     MONITORING  AGENCY  NAME  *   AODRESSff/  dllfmtmnt  from  Controlling  Olllc*) 

Naval  Postgraduate  School 
Monterey,  CA   9  3940 


IS.     SECURITY  CLASS,  (of  thlm  riport) 

Unclassified 


I  So.     DECLASSIFI  CATION/ DOWNGRADING 
SCHEDULE 


16.     DISTRIBUTION  STATEMENT  (at  thlt  Report', 

Approved  for  public  release;  distribution  unlimited. 


17.     DISTRIBUTION  STATEMENT  (of  tho  mbmtrmct  mntmrmd  In  Block  20.  II  dllloronl  from  Roport) 


18.     SUPPLEMENTARY  NOTES 


19.    KEY  WOROS  (Contlnum  on  rmwmroo  m!4o  if  nmcmmmmrr  mnm  laontlfy  by  block  nummort 


emulation 
AN/UYK-7 
interpreter 
microprogramming 


20.     ABSTRACT  (Contlnuo  on  rmvmrmm  olttm  If  nocooomr  mnd  Identify  by  •/•«*  iw bor) 

A  workable  design  is  presented  for  emulating  the  AN/UYK-7 
multiprocessing  computer  system  on  the  Burrough's  Interpreter 
Based  System,  the  D-Machine.   The  program  developed  provides 
for  exact  execution  of  the  AN/UYK-7  instruction  repertoire  with 
the  exception  of  Floating  Point,  hardware  interrupts  and  IOC 
Instructions.   The  design  allows  for  future  expansion  to 
incorporate  these  functions.   Input/Output  is  limited  to  a  card 


I 


DD  .EKi  1473 

(Page  1) 


EDITION  OF  1  NOV  «•  IS  OBSOLETE 

S/N   0102-014-660  1   | 


SECURITY  CLASSIFICATION  OF  THIS  PAGE  (Vhmn  Dmtm  tntorod) 


JliCuWlTY    CLASSIFICATION    OF    THIS   P>GEf"^»n    D-K  Enl»r»d 

20.   (cont.) 


reader,  line  printer  and  single  disk.   Various  aspects  of 
Emulation,  the  D-Machine,  and  the  AN/UYK-7  are  discussed 
and  a  detailed  User's  Manual  is  provided  along  with  recom- 
mendations for  modifying  the  design  into  a  full  emulation. 


DD   Form   1473 

S/N       0102-014-6601  SECURITY   CLASSIFICATION   OF   THIS  PAGEO**."  D.t.  ffnf.r.d) 

2 


Emu  1  at  i  on 

of  the 
AN/UYK-7 
Tactical  Data  Comouter 

On  the 
Burrough's  D-Machine 

by 


Jerry  Michael  Haggerty 
Lieutenant f  United  States  Navy 
B.S.,  United  States  Naval  Academy,  1970 


John  Michael  Hartling 
Lieutenant,  United  States  Navy 
B.S.,  Miami  University,  Oxford,  Ohio,  1969 

Submitted  in  partial  fulfillment  of  the 
requirements  for  the  degree  of 


MASTER  OF  SCIENCE  IN  COMPUTER  SCIENCE 


f  rom  the 


NAVAL  POSTGRADUATE  SCHOOL 
DECEMBER  1976 


«VAL  POSTGRADUATE  SCHOOL 

ABSTRACT 


A  workable  design  is  presented  for  emulat  ina  the 
AN/UYK-7  multiprocessing  computer  system  on  the  Burrough's 
Interoreter  Based  System/  the  D-Machine.  The  program 
developed  provides  for  exact  execution  of  the  AN/UYK-7 
instruction  repertoire  with  the  exception  of  Floating  Point/ 
hardware  interrupts  and  IOC  Instructions.  The  design  allows 
for  future  expansion  to  incorporate  these  functions. 
Input/Output  is  limited  to  a  card  reader/  line  printer  and 
single  disk.  Various  asoects  of  Emulation/  the  D-Machine/ 
and  the  AN/UYK-7  are  discussed  and  a  detailed  User's  Manual 
is  provided  along  with  recommendations  for  modifying  the 
design  into  a  full  emulation. 


CONTENTS 


ACKNOWLEDGEMENTS 8 

I.  INTRODUCTION 9 

II.  EMULATION 12 

A.  GENERAL  CONCEPTS  OF  MICROPROGRAMMING 13 

B.  BUILDING  AN  EMULATOR 17 

C.  APPLICATIONS 24 

III.  THE  AN/UYK-7 27 

A.  INTERRUPTS 28 

B.  CENTRAL  PROCESSOR 29 

1.  Program  Address  Reqister  (PAR) 30 

2.  Active  Status  Register  (ASR) 31 

3.  Base  Register  (S) 32 

4.  Arithmetic  Reaister  (A) 32 

5.  Index  Register  (B) 32 

C.  INSTRUCTION  FORMAT 3a 

D.  MODES  OF  OPERATION 37 

IV.  BURROUGH'S  D-MACHINE 38 

A.  GENERAL  DESCRIPTION 38 

1.  Logic  Unit  (LU) 38 

2.  Memory  Control  Unit  (MCU) 42 

3.  Control  Unit  (CU) ^3 

4.  Microprogram  ( ^-Memory ).......... 44 

B.  NAVAL  POSTGRADUATE  SCHOOL  CONFIGURATION 47 


1.   Desc  r  i  ot  i  on  .  . 47 

3.   I/O  Interface 49 

3.   Memory  Interface 49 

C.  INSTRUCTION  TIMING 50 

D.  LANGUAGES 51 

1.  ALGOL 51 

2.  TRANSLANG 5? 

V.  PROJECT  DESCRIPTION 54 

A.   LOADER 56 

8.   EMULATION  PROGRAM 57 

C.  REGISTER  MAPPING 67 

D.  TIMING 69 

VI.  SUMMARY 71 

A.   PROBLEMS 71 

8.   CONCLUSIONS 73 

VII.  RECOMMENDATIONS 75 

APPENDIX  A.  USER'S  MANUAL 78 

APPENDIX  8.  EMULATOR  PROGRAM  LISTING 91 

APPENDIX  C.   LOADER  PROGRAM  LISTING 139 

APPENDIX  D.   SAMPLE  AN/UYK-7  SORT  PROGRAM 154 

APPENDIX  t.   SAMPLE  LOADER  OUTPUT  LISTING 157 

APPENDIX  F.   SAMPLE  DEBUGGER  OUTPUT  LISTING 161 

GLOSSARY 167 

6 


BIBLIOGRAPHY 175 


INITIAL  DISTRIBUTION 178 


ACKNOWLEDGEMENTS 


We  would  like  to  take  this  opportunity  to  express  our 
sincere  appreciation  to  the  following  people  for  the  support 
they  have  provided  us  over  the  last  six  months  during  our 
pursuit  of  this  thesis.  To  Professor  S.  Jauregui*  first 
for  sponsoring  the  thesis*  and  second  for  providing  funds 
for  research  trips  to  PaoH #  Pa.  and  San  Diego*  Ca. 
without  w  h.  i  c  h  the  project  could  not  have  been  done.  To  Mr. 
J.  Lynch*  Burrough's  Advanced  Development  Organization 
(ADO)*  for  providing  software  and  hardware  engineers  on 
three  occasions*  and  whose  personnel  graciously  answered  our 
guestions  during  almost  daily  phone  calls.  To  Mr.  Carl  Ben- 
son* Naval  Electronics  Systems  Engineering  Center  (NESEO* 
San  Diego*  for  his  financial  support  and  personal  interest 
in  the  project.  And  last  but  not  least  our  wives  ana  fami- 
lies who  had  the  patience  to  see  us  through  this  thesis  in 
spite  of  our  1M  hour  days  away  from  home*  and  who  soothed 
our  frayed  nerves  when  things  did  not  go  right. 


I.   INTRODUCTION 


In  its  effort  to  provide  the  Fleet  with  officers  well 
versed  in  all  aspects  of  Computer  Sciencef  the  Naval  Post- 
graduate School  strives  to  furnish  each  student  in  the  Com- 
puter Science  Curriculum  with  ample  opportunities  for 
hands-on  operation  and  programming  exDerience  on  a  variety 
of  computer  systems.  The  systems  presently  available  for 
this  puroose  include  the  IBM  360/67,  POP  11/45,  XOS  9300, 
and  several  varieties  of  microcomputers  and  stand  alone 
graphic  systems.  Unfortunately,  this  wide  range  of  avail- 
able systems  and  their  incorporated  programming  languages 
does  not  include  any  of  the  numerous  tactical  computer  sys- 
tems in  use  in  the  Fleet  today?  moreover,  because  of 
budgetary  and  procurement  lead  time  constraints,  it  is 
highly  unlikely  that  the  school  will  have  such  a  system  in 
the  near  future.  To  provide  the  desired  systems,  the  Chief 
of  Naval  Education  and  Training  and  the  Naval  Postgraduate 
School*  with  the  assistance  of  Burrough's  Corporation,  have 
provided  a  medium  through  which  students  may  gain  experience 
and  perform  research  on,  not  one  or  two  Tactical  Data  Sys- 
tems but  potentially  on  any  particular  computer  in  which  the 
student  may  express  an  interest.  This  medium  is  the 
Burrouqh's  Interpreter  Based  System,  a  microprogrammable 
computer,  hereafter  referred    to  as  the  Burrough's  D-Machine. 


Through  microproqramming,   the   D-Machine   can   be   made   to 
operate  exactly  like  any  designated  computer  of  interest. 

Through  the  process  of  Emulation  the  authors  sought  to 
demonstrate  that  the  D-Machine  could  be  microprogrammed  to 
imitate  a  selected  computer.  As  the  target  computer,  the 
authors  selected  the  AN/UYK-7  which  is  used  extensively  in 
Tactical  Data  Systems  and  is  one  of  the  more  complex  systems 
in  use  today.  It  was  felt  that  if  a  realistic  emulation  of 
the  AN/UYK-7  could  be  demonstrated*  then  any  lower  level » 
less  sophisticated  computer  could  also  be  successfully  emu- 
1 ated. 


The  goal  of  this  thesis  was  not  a  complete  AN/UYK-7 
emulation*  but  rather  development  of  the  design  for  the  Emu- 
lation* and  adoption  of  a  sufficient  subset  of  the  AN/UYK-7 
instruction  repertoire  to  demonstrate  exact  and  efficient 
execution  of  AN/UYK-7  programs.  The  oesign  allows  for  a 
complete  emulation  of  all  AN/UYK-7  functions  and  provides 
for  future  expansion  to  a  complete  emulation  including  all 
IOC  Functions.  Chapters  II*  III  and  IV  are  designed  to 
provide  the  reader  with  a  general  knowledge  of  Emulation* 
the  AN/UYK-7  and  the  Burrough's  D-Machine.  Chapter  V 
describes  the  methods  used  for  imitating  the  AN/UYK-7 
instructions  and  its  various  modes  of  operation.  Chapter  V 
also  defines  the  maooing  of  the  AN/UYK-7  Control  Memory 
Registers  and  status  bits  into  the  Burrough's  D-Machine  for 
the  purpose  of  this  Emulation.  Chapter  VI  presents  some  of 
the   problems   encountered  in  the  course  of  this  thesis*  and 

10 


the  conclusions  drawn  by  the  authors  as  a  result  of  this 
Emulation,  ChaDter  VII  orovides  recommendations  for  expand- 
ing this  Emulation  and  suggests  possible  follow  on  thesis 
topics.  Appendix  A  is  included  as  a  User's  Manual »  and  con- 
tains information  on  how  to  use  the  D-Machine,  how  to  run 
AN/UYK-7  programs  on  the  Emulator/  and  how  to  use  special 
features  of  the  microprogramming  language  TRANSLANG  which 
were  not  documented  in  the  TRANSLANG  Programmer's  Manual. 
The  program  listings  of  the  Loader  and  Emulator/  written  in 
association  with  this  thesis  and  used  to  demonstrate  the 
feasibility  of  the  design  by  running  AN/UYK-7  Programs/  are 
included  as  Appendix  B  and  C.  A  sort  routine  written  in 
AN/UYK-7  machine  language/  and  used  to  demonstrate  the 
Emulator's  capability  is  orovided  in  Apoendix  D.  The  output 
of  the  sort  program  and  the  optional  Loader  functions  of 
assembler  and  debugger  are  presented  as  Appendix  E  and  F. 


11 


II.   EMULATION 


Modern  computer  systems  are  generally  composed  of  five 
basic  units:  input*  outout*  memory*  ar i t hme t i c/ 1 ogi c *  and 
control.  The  instruction  execution  and  communications  among 
these  units  are  usually  well  understood  with  the  exception 
of  the  control  unit  which  is*  typically*  understood  only  by 
the  system  engineer.  The  control  unit  generates  the  signals 
necessary  for  the  information  flow  and  timing  of  the  system. 
In  conventional  computers  this  is  done  through  the  use  of 
flip-flops  (e.g.  registers  and  counters)  and  gates  designed 
in  a  relatively  ad  hoc  manner.  Microprogramming  the  control 
unit  has  been  proposed  as  an  orderly  alternative  to  this  ad 
hoc  design  procedure  where  the  hardware  of  the  control  sec- 
tion is  replaced  by  a  "microprogram  control"  unit. 

Microprogramming  is  therefore  a  technique  for  imple- 
menting the  control  function  of  a  digital  computer  using 
programmable  control  signals  stored  in  a  separate*  word- 
organized  memory*  called  control  store.  If  the  control 
store  were  a  programmable  memory*  then  the  system  architec- 
ture could  be  modified  to  optimize  processing  of  each  task 
to  be  performed;  moreover*  it  could  be  altered  completely  to 
resemble  the  architecture  of  another*  entirely  different 
machine.  The  microprogramming  of  the  control  store  of  a 
computer  system  to  alter  the  basic  architecture  enablina  one 


12 


machine  (the  host  machine)  to  execute  machine  language  pro- 
grams intended  for  another  machine  (the  target  machine)  is 
defined  as  Emulation. 

The  remainder  of  this  chanter  is  divided  into  three 
sections:  general  information  on  microprogramming,  construc- 
tion of  an  emulator  and  applications  of  emulation. 

A.   GENERAL  CONCEPTS  OF  MICROPROGRAMMING 

Since  the  cost  of  software  has  become  a  major  portion  of 
the  overall  cost  of  comouter  systems  today,  more  and  more 
manufacturers  and  users  are  turning  to  microprogramming  the 
control  section  of  their  computer  to  tailor  the  machine  to 
individual  app 1 i cat i ons ,  thereby  making  computer  programming 
more  efficient. 

The  main  function  of  the  control  section  is  to  specify 
the  conditions  under  which  sets  of  gates  are  to  be  opened. 
In  conventional  machines  this  can  lead  to  a  very  complex, 
hardwired  system,  especially  if  the  instruction  set  is 
extensive.  A  relatively  simple  field  change*  addition  or 
alteration,  may  reguire  a  major  modification  of  this  complex 
system.  This  is  not  true  in  a  computer  that  uses  a 
mi c roprogrammab 1 e  control  store.  The  complex  hardwired 
structure  is  replaced  by  microinstructions  stored  in  the 
control  store,  one  microinstruction  per  word,  which  tell  the 
system  which  arithmetic  and  loaic  ooerations  to  perform  by 
specifying   which   gates   to   enable/disable.    In  this  way, 


13 


control  of  the  comouter  is  removed  from  the  hardware  and 
placed  under  the  control  of  the  microprogrammer.  This 
places  a  heavy  burden  on  the  programmer  since  he  must  become 
intimately  familiar  with  the  innermost  workings  of  the 
machine/  however/  it  allows  him  to  m oci el  the  machine  to  his 
specific  programming  needs.  This  gives  the  microorogrammer 
extreme  flexibility  in  his  aoplications  on  the  computer. 

There  are  two  types  of  microinstructions:  vertical  and 
horizontal.  Vertical  microinstructions  usually  control  one 
operation;  and  the  address  of  the  successor  microinstruction 
is  implicitly  the  current  address  plus  one/  unless  the 
current  microooeration  causes  a  branch.  In  horizontally  mi- 
croprogrammed machines  each  control  bit  of  a  microinstruc- 
tion is  assignee  to  a  specific  gate  or  set  of  gates.  This 
means  that  one  microinstruction  can  control  multiple  opera- 
tions. On  the  other  hand/  vertical  microinstructions  are 
divided  into  separate  fields/  each  of  which  are  then  decoded 
to  enable/disable  specific  qates  or  sets  of  gates?  there- 
fore/ horizontal  microinstructions  reauire  less  decoding  and 
provide  more  flexibility.  However/  the  advantage  of  verti- 
cal microinstructions  is  that  they  generally  reguire  shorter 
control  words  considerably  reducing  the  overall  cost  of  con- 
trol micromemory.  The  length  of  control  words  vary  from  20 
bits  (vertical)  to  in  excess  of  120  bits  (horizontal);  the 
average  microinstruction  is  50-80  bits.  The  D-Machine/  the 
host  machine  for  this   thesis/   utilizes   a   combination   of 


14 


vertical  (Type  II)  and  horizontal  (Tyoe  I)  microinstructions 
in  the  form  of  a  56-bit  word. 

Since  the  execution  time  of  one  horizontal  microinstruc- 
tion is  essentially  the  same  as  that  of  one  vertical  mi- 
croinstruction/ the  multiple  operations  performed  during  one 
horizontal  instruction  is  a  desirable  feature.  This  paral- 
lelism can  drastically  reduce  the  size  of  a  microprogram, 
and  dramatically  decrease  execution  times.  These  reductions 
can  only  be  realized*  however*  if  the  programmer  can  recog- 
nize concurrent  actions  and  optimally  group  them  into  one 
instruction.  A  great  deal  of  work  has  been  done  toward  in- 
cluding the  efficient  use  of  available  resources  into  a  com- 
piler for  a  high-level  m i c roorogrammi ng  language*  but  with 
little  success.  Either  the  probability  of  making  the  deter- 
mination is  low*  or  the  cost  of  the  optimization  is  too 
high.  Much  additional  research  is  requirea  in  the  area  of 
recognizing  and  combining  potentially  concurrent  actions. 

Different  m i c ro i nt rue t i ons  specify  different  microopera- 
tions  to  be  performed*  and  deoending  on  the  nature  of  the 
mi c rooperat i ons *  some  phase  of  one  instruction  may  overlap  a 
phase  of  a  subsequent  instruction.  Instruction  timing  is* 
therefore*  an  imoortant  factor  in  the  overall  efficiency  of 
microprograms  in  which  m i c rooperat i ons  are  not  mutually  ex- 
clusive. A  brief  description  of  the  timing  considerations 
that  must  be  made  in  microprogramming  the  Burrough's  D- 
Machine  is  given  in  Chapter   IV. 


15 


Many  main-frame  manufacturers  hesitate  to  allow  the  no- 
vice programmer  access  to  the  innermost  workings  of  their 
computer  (e.g.  registers/  data  oaths/  and  gates).  One 
method  of  prohibiting  this  access  is  to  use  read-only  m  i  - 
cromemory  with  the  microprograms  being  provided  by  the  com- 
puter manufacturer.  This  helps  preserve  the  designed  iden- 
tity of  the  computer  out  does  not  provide  for  its  optimum 
use.  The  programmer  who  is  given  the  capability  of  modify- 
ing the  logical  design  of  the  machine  to  his  specific  pro- 
gramming needs  will  find  his  programming  tasks  greatly  sim- 
plified. For  example*  he  could  implement  new  instructions* 
such  as  floating  point*  which  were  not  designed  into  the 
original  mach  i  ne . 

In  summary*  microprogramming  is  becoming  more  widely 
used  for  the  following  reasons:  1)  the  flexibility  and 
growth  potential  of  mi c roprogrammab 1 e  machines  (especially 
in  the  area  of  emulation)*  2)  increasing  software  costs  and 
current  semi-conductor  technology  favor  microprogram  design* 
and  3)  user-or i en t ec  instructions  can  be  designed  into 
machines  through  microprogramming. 


16 


B.   BUILDING  AN  EMULATOR 

Emulation  describes  a  orocess  through  which  the  hardware 
components  of  one  machine  (host)  are  made  to  "appear"  to  as- 
sume the  soecific  characteristics  of  the  hardware  of  another 
machine  (target).  This  provides  the  host  machine  with  the 
capability  of  executing  machine  language  instructions 
written  for  the  target  machine.  Simulation  is  a  software 
process  that  provides  the  same  capability  for  program 
execution?  however*  simulation  involves  interpretive 
execution  Dy  a  high-level  language  program.  Emulation 
differs  in  that  an  emulator  performs  its  interpretive  execu- 
tion through  the  hardware.  Simulations  usually  perform 
within  a  factor  of  100-200  times  real-time.  Emulation  is 
generally  within  a  factor  of  10,  but  often  can  be  tuned  to 
approach  real-time.  For  this  reason  emulations  are  usually 
more  cost-effective  than  simulations.  The  following  oara- 
graphs  describe  the  process  involved  in  building  an  emula- 
tor. 

There  are  two  major  aporoaches  to  emulating  a  target 
machine:  1)  the  hardware  and  firmware  (the  physical  realiza- 
tion of  a  microprogram)  can  be  used  in  conjunction  with  a 
software  simulator  (software  alone  would  be  pure  simula- 
tion)/ or  2)  the  hardware  and  firmware  can  execute  with  no 
software  suooort . 

Depending  on  trie  percentage  of  software  utilized/  a 
software-assisted   emulation   may   be  somewhat  slower  than  a 


17 


firmware  emulation.  Typically/  the  programmer  mentally 
develops  a  software  simulation  of  the  target  machine.  He 
then  decides  which  sequences  of  instructions  are  most  fre- 
quently used,  and  which  are  the  hardest  to  simulate.  These 
become  candidates  for  microprogramming.  Frequently  a  single 
new  instruction  can  be  microprogrammed  to  replace  repetitive 
sequences  of  the  same  high-level  instructions,  thus  speeding 
up  the  emulation.  With  this  software-firmware  approach  the 
user  must  decide  the  point  at  which  he  must  stop  substitut- 
ing microcode  for  software  routines.  This  is  generally 
dependent  on  the  amount  of  control  storage  available*  or  the 
cos t -per f ormance  criteria  with  which  he  is  working.  An  ex- 
ample of  a  software-hardware  approach  to  emulation  is  the 
IBM  7000  series  emulators  used  with  the  IBM  System/360  Model 
65. 

The  Burrough's  D-Machine  provides  the  capability  of  emu- 
lation using  the  software-hardware  method.  A  simulation  is 
written  in  the  high-level  language  ALGOL.  ALGOL  on  the  D- 
Machine  allows  the  user  to  define  a  new  operator  which,  when 
called  in  the  simulation  program,  branchs  to  a  preprogrammed 
series  of  microinstructions;  executes  the  microinstructions; 
and  returns  to  the  ALGOL  program.  This  gives  the  user  the 
ability  to  execute  frequently  used  routines  (such  as  in- 
struction fetch)  from  micromemory  which  has  a  faster  cycle 
time  than  that  of  main  memory  where  the  ALGOL  simulator  re- 
sides. An  advantaqe  to  this  approach  is  that  the  system 
does   not   have   to  oe  regenerated  after  different  emulators 


18 


are  run  since*  in  essence*  only  an  ALGOL  program  has  been 
executed.  However*  as  previously  discussed*  this  software 
emulator  is  slower  than  a  firmware-controlled  emulator. 

The  authors  used  the  hardware-firmware  approach  in  their 
emulation  of  the  AN/IJYK-7.  This  method  will  be  developed  in 
more  detail  along  with  suggested  hardware  additions  which 
could  enhance  the  emulation.  Control  of  the  system  resides 
entirely  in  the  firmware*  which  means  that  the  emulator* 
once  loaded*  dedicates  the  machine  to  that  emulation*  and 
native  mode  programs  can  no  longer  execute  until  system  re- 
generation. This  unproductive  overhead  of  loading  and  re- 
loading the  emulator  and  the  native  mode  machine  is  one 
drawback.  An  additional  drawback  is  the  larger  micromemory 
required  since  the  entire  emulation  is  microprogrammed. 
However*  the  emulator  executes  exclusively  through  firmware 
making  this  approach  to  emulation  significantly  faster.  An 
example  of  a  firmware-controlled  emulator  is  the  IBM  1401 
emulator  on  the  System/360  Model  30. 

Although  systems  such  as  the  D-Machine  use  horizontal 
microinstructions  to  enable  oarallel  or  concurrent  opera- 
tions* the  microprogram  can  only  perform  one  function  of  the 
target  machine  at  a  time.  That  is*  if  the  target  machine 
performs  parallel  operations  such  as  executing  one  instruc- 
tion while  simultaneously  fetching  the  next  instruction*  the 
microprogram  can  only  emulate  one  of  these  functions  at  a 
time.  It  must  execute  the  current  instruction  and  then 
fetch  the  next  instruction.   For  this  reason*   emulation   is 


19 


usually   slower  than  the  real  time  performance  of  the  target 
machine  even  though  it  may  have  a  faster  memory  cycle  time. 

In  order  to  emulate  a  target  machine*  the  microprogram- 
mer  must  first  understand  three  areas:  1)  the  host  machine* 
2)  the  target  machine  and  3)  the  m i c ro 1 anguage .  Second*  the 
registers*  counters*  and  accumulators  of  the  target  machine 
must  be  mapped  into  the  host  machine.  This  is  often  done  in 
two  steps  -  depending  on  the  number  of  available  registers 
in  the  host  machine.  The  registers  of  the  target  machine 
most  freguently  used  should  be  mapped  directly  to  registers 
in  the  host  where  possible.  The  remaining  registers  of  the 
emulated  machine  are  mapped  into  the  host's  main  memory.  As 
many  of  the  target  machine's  registers  as  possible  should  be 
mapped  directly*  so  that  fewer  memory  references  will  be  re- 
quired Dy  the  emulator.  For  example*  if  the  emulator  were 
executing  a  Load  Accumulator  instruction  and  the  specified 
accumulator  had  been  mapped  into  one  of  the  host's  regis- 
ters* then  only  one  microinstruction  is  needed  to  emulate 
the  load  instruction.  However*  if  the  accumulator  had  been 
mapped  to  a  memory  location*  then  it  would  take  several  mi- 
croinstructions to  emulate  the  entire  operation  -  i.e.  setup 
the  store  address*  store  the  value  to  be  loaded  into  the 
write  register*  and  perform  a  write  to  main  memory.  Not 
only  does  this  require  additional  instructions*  but  it  also 
includes  a  main  memory  access*  whose  cycle  time  is  slower 
than  m i c romemory ' s  cycle  time.  Some  instructions  may  re- 
quire two  main  memory  cycles*   such   as   an   ADD   where   the 


20 


maDped  accumulator  must  be  read,  added  to  and  then  written 
out.  This  demonstrates  the  necessity  of  mapping  as  many 
registers  as  oossible  to  the  host  machine's  hardware.  Sel- 
dom, however*  can  this  mapping  be  accomplished  without  some 
use  of  main  memory?  therefore*  the  m i c roprogrammer  must 
select  some  portion  of  main  memory  as  a  privileged  area  for 
reaister  mapping.  The  authors  reserved  the  first  1024  words 
of  main  memory  in  the  emulation  of  the  AN/UYK-7,  for  regis- 
ter and  buffer  mapping. 

The  next  step  in  the  emulation  is  to  assume  that  a 
user's  object  program  is  resident  in  main  memory.  The  emu- 
lator must  then  fetch,  decode  and  execute  the  program,  in- 
struction by  instruction.  The  m i c roprogrammer  must  decide 
which  emulation  functions  should  be  written  as  subroutines, 
and  which  functions  should  be  written  in  line.  The  most  fre- 
quently referenced  subroutine  in  any  emulation  is  the  fetch 
routine  since  it  is  executed  for  every  instruction.  The 
normal  steos  involved  in  this  routine  arel 


1.  Determine  the  address  of  the  next  instruction 
as  indicated  by  the  program  address  reaister. 

2.  Read  the  instruction  from  the  main  memory  ad- 
dress calculated  in  step  1.  This  is  the 
current  instruction  to  be  emulated. 

3.  Decode  the  instruction  into  its  designator 
fields. 

a.  Calculate  the  operand  address.  (The  AN/UYK-7 
uses  a  displacement  plus  an  index  register  plus 
a  base  register). 

5.   Read  the  ooerand  fro1""  main  memory. 


21 


6.  Perform  indirection  if  allowed  and  indicated. 

7.  Some  instruction  sets,  AN/UYK-7  for  example, 
allow  whole  or  half-words.  Check  if  current 
instruction  is  half-word. 

8.  Some  instruction  sets  ooerate  on  partial  word 
operands.  If  so  determine  if  quarter,  half  or 
full-word  operand  is  to  be  used. 


These  steps  must  be  executeo  for  each  instruction 
fetched  from  the  user's  program.  Depending  on  the  particu- 
lar instruction  beinq  emulated,  some  of  these  steps  may  be 
omitted  (step  8  is  only  performed  for  Format  I  instructions) 
but  the  majority  are  generally  apolicable.  This  demon- 
strates the  overhead  involved  in  emulation  prior  to  branch- 
ing to  the  microroutine  that  does  the  actual  instruction  ex- 
ecut  i  on . 

Some  hardware  additions  that  can  facilitate  emulation 
are  a  fast  shifter  and  a  field  select  unit  (FSU).  The 
shifter  simplifies  va r i ab 1 e-1 enqt h  byte  extraction,  a  common 
emulation  process.  For  instance,  in  the  D-Machine  it  takes 
the  same  amount  of  time  to  shift  a  word  by  1  bit  as  it  does 
for  any  shift  uo  to  31  Oits.  The  FSU  allows  the  testing  of 
selected  fields  without  requiring  a  cycle  to  go  through  the 
adder  (the  O-Machine  does  not  have  this  feature).  This  re- 
lieves the  programmer  of  masking  and  shifting  fields  prior 
to  testing  them.  These  two  features  are  the  most  common  and 
cost-effective  additions  to  the  hardware. 


22 


One  approach  to  emulation  that  has  recently  come  into 
use;  but  which  is  not  that  widely  usea  or  understood/  in- 
volves using  a  combination  of  hardware/  software  and  operat- 
ing system.  IBM  js  experimenting  in  this  area,  and  has  es- 
tablished the  following  design  characteristics  for  the  Sys- 
tem/370 emulators: 


1.  Emulators  must  be  integrated  with  the  operating 
system  and  run  as  a  problem  program.  This  el- 
iminates the  overhead  of  loading  and  reloading 
the  emulator  and  the  native  mode  machines. 

2 .  Allow  multiprogramming  of  emulators  as  well  as 
a  mix  of  emulators  and  native  mode  programs. 

3.  All  programs  including  emulators  must  be  inter- 
rupt i  b  1  e. 


With  such  a  system  IBM  felt  they  could  give  the  user  an 
improved/  more  efficient  environment  from  which  to  operate/ 
either  in  the  emulator  or  native  mode.  The  authors  feel 
this  should  be  a  primary  field  for  future  applications. 

The  final  item  to  be  discussed  in  the  Section  is  emula- 
tion of  Inout/Output  operations.  Most  sources  agree  that 
emulation  of  I/O  is  as  difficult/  if  not  more  so/  than  the 
implementation  of  the  central  processor's  instruction  set. 
This  is  true  primarily  because  once  the  basic  routines  need- 
ed for  instruction  and  operand  fetch  are  programmed/  the  ac- 
tual instruction  executions  are  fairly  easy  to  microprogram. 
This  is  not  necessarily  true  with  I/O  -  buffers  must  be  set 
up/  data  conversion  possibly  performed/  ana  perhaps  the 
hardest   Doint/  emulating  circumstances  in  which  results  are 


23 


not  yet  known.  For  instance/  if  the  I/O  is  to  search  for  a 
specified  record/  then  what  happens  if  the  key  cannot  be 
found?  There  are  many  such  checks  or  error  conditions  that 
make  I/O  difficult  to  emulate.  Another  major  problem  is 
emulating  interrupt  handling  during  I/O.  Since  emulation  of 
I/O  is  essentially  a  separate  topic  and  since  the  authors 
did  not  implement  emulation  of  the  AN/UYK-7  Input/Output  in- 
struction set  as  part  of  the  thesis*  I/O  emulation  will  not 
be  descrioed  in  any  further  detail.  However/  references  5/ 
12/  15/  21/  and  22    provide  excellent  material  on  this  topic. 

C.   APPLICATIONS 

This  section  is  designed  to  familiarize  the  reader   with 

some   of  the  apolicable  areas  for  emulation  usage.   It  is  by 

no  means  an  exhaustive  study  of  this  topic/  nor  is  it  in- 
tended to  be  so. 

Emulation  was  first  used  in/  and  is  still  the  primary 
application  for/  converting  from  second  generation  computing 
systems  to  third  generation  systems.  Normally/  the  process 
is  costly  and  danqerous  in  the  aspect  of  converting  programs 
running  on  the  existinq  system  to  programs  capable  of  exe- 
cuting on  the  new  machine.  There  are  several  methods  other 
than  emulation  capable  of  performing  this  task/  none  of 
which  are  completely  satisfactory:  simulation  is  slow;  au- 
tomated translation  is  unproven;  and  instruction  by  instruc- 
tion reorogramm i ng  is  costly  and  cumbersome.  The  advantaoe 
of  emulation  is  that  if  the  old  machine  could  be  emulated  on 


24 


the  new  machine  allowing  direct  execution  of  all  old  pro- 
grams* then  the  old  Drograms  could  be  converted  at  leisure? 
if  desired  and  justified.  For  example?  reprogramming  might 
not  be  cost  effective  or  justified  for  a  program  with  an  ex- 
pected life  span  of  six  months.  In  such  circumstances  con- 
tinued emulation  of  the  program  is  the  solution.  However? 
the  situation  might  be  different  if  the  program  had  an  ex- 
pected life  span  of  three  years. 

Another  major  application  for  emulation  is  the  design? 
development?  and  testing  of  a  newly  conceived  system  on  an 
existing  system.  The  target  machine  does  not  necessarily 
have  to  be  an  existing  computer  system?  and  the  user  could 
experiment  with  the  design  of  any  machine  he  desires.  In 
this  way  a  richer  instruction  set  can  be  achieved?  moreover? 
software  and  diagnostic  routines  could  be  developed  for  the 
new  machine  prior  to  the  machine  even  being  produced  or 
marketed.  IBM  used  this  method  to  some  extent  by  emulating 
System/370  on  System/360  prior  to  building  System/370.  This 
application  tends  to  decrease  the  time  from  initial  con- 
struction to  marketing  because  software?  such  as  the  operat- 
ing system?  can  be  tested  and  debugged  concurrently. 

A  third  application?  and  one  seen  as  a  major  trend  for 
the  future?  is  the  ability  of  the  user  to  adapt  the  computer 
to  his  individual  neeas.  Modern-day  computers  are  built  as 
powerful?  general-ourpose  machines  designed  to  operate 
effectively  over  a  large  field  of  problems.  In  doing  so? 
however?   the   machine   cannot  optimize  execution  of  any  one 


25 


particular  application.  Emulation  gives  the  user  this 
ability.  The  user  can  either  operate  from  an  existing 
emulator,  or  he  can  tune  the  emulator  to  his  individual 
application  through  microprogramming.  One  user  may  want  a 
machine  oriented  toward  string  operations,  while  another 
user  mav  be  doing  extensive  scientific  calculations.  If 
each  user  could  execute  from  a  separate  emulator  tuned  to 
his  individual  application,  then  each  would  be  more 
efficient  and  productive.  In  addition  the  computer  would 
orobably  be  easier  for  the  user  to  program.  This  is  the 
area  where  mu 1 t i programmi na  of  emulators  is  projected  to  be 
of  the  most  use . 

There  are  several  other  areas  of  emulation  usage  which 
were  not  discussed?  such  as  the  academic  environment  for 
research  purooses  (the  reason  for  this  thesis),  and  tuning 
of  existing  software.  However,  as  previously  stated,  this 
section  was  designed  only  to  give  the  reader  a  flavor  of  the 
possible  uses  of  emulation  and  perhaps  stimulate  his  own 
ideas  for  oossible  applications.  For  additional  and  more 
detailed  material  see  references  2,  15  through  18,  and  20 
through  24. 


26 


III.   THE  AN/UYK-7 


This  chapter  is  intended  to  introduce  the  reader  to 
those  operational  characteristics  and  capabilites  of  the 
AN/UYK-7  computer  most  pertinent  to  the  Emulation.  This 
will  assist  the  reader  in  understanding  the  design  and  map- 
pings used  in  this  Emulation,  and  presented  in  subsequent 
chapters.  This  chapter  is  not  intended  to  be  a  technical 
manual  and  should  not  be  used  for  that  ourpose.  The  reader 
should  consult  references  26  and  27  for  more  detailed  infor- 
mation. 

The  AN/UYK-7  is  a  highly  reliable,  ruggedized,  mul- 
tiprocessor system  designed  and  manufactured  by  the  Univac 
Division  of  Soerry  Rand  Corporation.  Built  to  military 
specifications  (MIL-E-16400) ,  it  is  utilized  extensively 
throughout  the  United  States  Navv  in  Tactical  Data  Process- 
ing aoplications  [2b).  Rapid  data  transfer  rates  are  pro- 
vided during  communications  between  external  devices ,  inter- 
nal random-access  memory,  and  the  central  processor.  The 
system  is  capable  of  average  command  execution  times  of  1.5 
microseconds,  and  an  input  data  transfer  rate  of  over  one 
million  32-bit  words  oer  second.  The  AN/UYK-7  maintains  two 
completely  separate  sets  of  index,  arithmetic  and  relative 
address  (Base)  registers,  for  use  during  Task  and  Executive 
states.    In   addition,   a  set  of  18  privileged  instructions 


27 


with  special  characteristics  for  executive  control  are 
reserved  for  the  Interruot  State.  These  features  alonq  with 
the  parallelism  of  AN/UYK-7  field  and  register  references, 
make  it  an  extremely  difficult  system  to  emulate  in  real- 
time. 


The  AN/UYK-7  was  desiqned  to  operate  as  either  a  single 
or  multiple  processor  system  with  up  to  256K,  32-bit  words 
of  random  access  memory.  This  allows  on-line  access  to 
1024K  bytes  through  an  instruction  feature  which  permits 
whole-word,  half-word/  or  quarter-word  memory  references. 
This  Emulation  assumed  an  AN/UYK-7  configuration  consisting 
of  a  single  processor,  monoorogramm  i  ng,  with  one  t>4K,  32-bit 
word  memory  module.  Partial  word  references  were  fully  emu- 
lated providing  random  access  to  256K  bytes. 

A.   INTERRUPTS 

The  AN/UYK-7  processes  data  in  real-time  in  response  to 
a  highly  prioritized  interrupt  system  with  decision-making 
properties.  This  oriority  system  allows  the  central  pro- 
cessor to  select  that  program  routine  which  is  necessary  to 
respond  to  the  interrupt  reguiring  the  most  urgent  atten- 
tion. Since  the  Emulator  was  designed  for  a  monoprogramming 
environment  using  asynchronous  I/O,  the  interrupt  features 
of  the  AN/UYK-7  were  not  fully  implemented.  Several  types 
of  interrupts,  such  as  Program  Faults  (Illegal  Instruc- 
tions), were  implemented  and  tested.  All  interrupt  handling 
flags,  lockouts  and  registers  were  maooed  into  the  Emulator. 


28 


This  will  facilitate  full  implementation  of  interrupt 
features  -  should  a  decision  be  made  to  incorporate  mul- 
tiprogramminq  or  synchronous  I/O  in  the  course  of  expansion 
to  a  full  Emu  1  at  i  on  . 

B.   CENTRAL  PROCESSOR 

The  AN/UYK-7  central  processor  contains  all  the  control > 
arithmetic  and  timing  circuitry  required  for  processing  al- 
Dhanumeric  data  and  for  executive  functions.  The  central 
processor  operates  in  two  different  modes  or  states:  the  In- 
terrupt State  executes  execut i ve-t yDe  functions*  and  the 
Task  State  processes  user  programs.  A  grouo  of  16 
privileged  instructions  and  a  separate  set  of  arithmetic* 
index  and  base  registers  are  reserved  for  the  exclusive  use 
of  the  processor  while  in  the  Interrupt  State.  These 
features  greatly  enhance  the  AN/UYK-7's  multiprocessing  and 
multiprogramming  capabilities.  These  special  instructions 
and  registers  were  mapped  into  the  Emulator;  however*  they 
were  not  fully  implemented  because  of  the  monoprogramming 
environment  in  which  the  Emulator  was  to  be  run. 

The  AN/UYK-7  maintains  a  central  processor  control 
memory  (CMR)  consisting  of  82  i nt egrat ed-c i rcu i t *  random- 
access  registers  of  varying  sizes  appropriate  to  their  func- 
tion (e.g.  A-registers  32-bits*  B-registers  20-bits).  The 
various  registers  are  grouoed  into  stacks  according  to  their 
use*  addressing*  and  relative  size.  In  the  Emulator*  these 
registers  were   maooed   into   the   D-MacMne's   main   memory 


29 


starting  at  address  0000,  with  address  assignments 
corresoondi ng  exactly  to  that  of  the  AN/UYK-7.  The  notable 
exception  was  that  OR  addresses  designated  as  "Unassigned" 
in  the  AN/UYK-7  were  used  as  temporary  storage  registers  in 
the  Emulator,  Register  mapping  is  discussed  in  more  detail 
in  Chapter  V  and  presented  in  tabular  form  in  Figure  V-2. 

The  AN/UYK-7  registers  of  particular  interest  to  the 
user  are:  the  Program  Address  Register  (PAR);  the  Active 
Status  Register  (ASR);  and  the  Base,  Index  and  Arithmetic 
Register  groups.  These  are  the  only  registers  which  are  ei- 
ther airectly  addressable  or  accessible  to  the  programmer. 

1.   Program  Address  Register  (PAR) 

The  PAR  is  a  20-bit  register  used  for  addressing  the 
next  instruction  to  be  fetched  from  memory  for  execution. 
It  consists  of  a  16-oit  di sol acement  value  and  a  3-bit  Base 
Register  reference.  The  effective  instruction  address  is 
formed  Dy  the  addition  of  the  displacement  and  the  contents 
of  the  selected  Base  register.  The  PAR  displacement  value 
is  incremented  by  one  word  at  the  completion  of  each  in- 
struction cycle  with  the  exception  of  JU^P  instructions. 
These  instructions  cause  reolacement  of  the  PAR  by  the  Ms" 
and  "y"  operand  fielas  of  the  JUMP,  thus  providing  for  out- 
of-seguence  instruction  execution.  The  PAR  mapping  in  the 
Emulator  is  not  composed  of  two  separate  fields*  but  rather 
as  the  calculated  effective  address.  This  greatly  simpli- 
fies  and   expedites   instruction   references;   however*   it 


30 


causes  some  difficulty  with  specific  instructions  which  re- 
quire access  to  the  two  separate  fields  of  the  PAR.  When 
encountered/  this  problem  was  overcome  by  dividing  the  PAR 
value  by  8K.  Since  the  Base  registers  were  preinitialized 
in  8K  increments^  starting  at  1024,  the  results  of  the  divi- 
sion yielded  a  auotient  eguivalent  to  the  Base  reaister  as- 
signment/ and  a  remainder  equal  to  the  displacement. 

2.   Active  Status  Register  (ASR) 

The  ASR  is  a  23-bit  register  used  to  indicate  and 
control  the  status  of  various  ooerations  in  the  central  pro- 
cessor. Individual  bits  of  the  register  are  assigned  spe- 
cial functions,  and  when  set  indicate  that  a  particular 
status  exists  and  that  the  processor  should  be  controlled 
accordingly.  Individual  bits  are  set/cleared  as  the  result 
of  either  an  instruction  execution  or  direct  processor  in- 
tervention. The  bits  of  particular  interest  to  the  program- 
mer are  the  arithmetic  bits  (equal/  greater  than  or  equal/ 
overflow/  and  limits)  which  are  set  as  the  result  of  arith- 
metic functions/  and  may  be  interrogated  Py  specific  in- 
structions/ such  as  conditional  jumps.  Based  on  the  con- 
dition of  the  bit  tested  these  conditional  instructions  may 
cause  a  change  in  the  program  sequence.  In  the  Emulator  the 
ASR  bits  most  freauently  referenced  by  the  programmer  are 
mapped  into  a  D-Machine  internal  register  together  with  the 
PAR.  This  considerably  reduces  main  memory  references/  and 
reduces  Emulator  execution  time.  The  ASR  mapoing  is  dis- 
cussed in  oetail  in  Chaoter  V. 


31 


3.   Base  Register  (S) 

There  are  two  sets  (Interrupt*  Task)  of  18-bit  S- 
Registers*  numbered  0-7.  These  registers*  used  in  final  Y- 
Operand  and  instruction  address  calculations*  are  necessary 
in  a  multiprogramming  and  mu 1 t i Drocess i ng  environment.  In 
spite  of  the  monoprogr ammm i ng  environment  of  the  Emulator* 
the  registers  were  mapped  and  used  as  designed*  however* 
they  were  ©reinitialized  by  the  Loader  at  8K  boundaries 
starting  at  address  1Q2U.  This  provided  the  Emulator  access 
to  64K  of  main  memory  in  increments  of  8K  Dages. 

tf •   Arithmetic  Register*  (A) 


There  are  two  sets  (Interrruot*  Task)  of  32-bit  A- 
Registers*  numbered  0-7.  They  are  used  extensively 
throughout  the  instruction  set  to  hold  one  or  more  of  the 
ODerand  -  inputs  to*  or  results  of  arithmetic  functions. 
The  A-Registers  also  serve  as  the  main  interface  between  the 
central  processor  and  main  memory.  These  registers  are 
directly  addressable  by  the  programmer. 


5.   Index  Register  (B) 


There  are  two  sets  (Interrupt*  Task)  of  20-bit  B- 
Registers*  numbered  1-7.  These  registers  can  be  used  as 
counters*  or  they  can  be  employed  in  a  special  addressing 
techniaue  called  Indexing.  During  normal  Y-Operand  address 
calculations*  the  designated  B-Register  is  added  to  the  y- 
displacement   and  a  specific  S-Register  to  form  an  effective 


32 


address.  This  address  is  then  considered  to  have  been  in- 
dexed by  the  B-Register  value.  Indexing  provides  the  pro- 
grammer with  the  option  of  seguentially  referencing  memory 
by  merely  incrementing  the  index  during  each  pass  through  a 
loop.  Reference  to  any  B-Register  other  than  B(0)  implies 
that  indexing  is  to  take  place  during  the  Y-Operand  address 
calculation.  A  reference  to  B(0)  is  treated  as  an  index  of 
zero  since  8(0)  is  not  a  valid  register.  In  the  Emulator, 
the  contents  of  B(0)  is  always  zero ,  and  references  to  B(0) 
are  conveniently  treated  the  same  as  references  to  B(l)  thru 
B(7).  In  the  AN/UYK-7,  the  8-Registers  have  the  same  inter- 
nal structure  as  the  PAR;  that  is,  they  consist  of  two 
fields  (a  Base  register,  and  a  displacement).  In  the  Emula- 
tor, B-Registers  are  treated  as  consisting  of  one  field 
which  can  be  separatea  into  its  two  respective  fields  by 
division  by  8K,  as  previously  described  in  the  PAR  discus- 
sion. 

In  order  to  minimize  access  time  and  field  decoding, 
all  CVR  registers  were  treated  as  32-bit  registers  in  the 
Emulator.  This  caused  no  oroblems  with  the  exception  of  the 
PAR  and  Index  Registers,  which  were  resolved  as  previously 
discussed.  The  A,  S,  and  B-Registers  are  directly  address- 
able through  the  Load/Store  CMR  Instructions  of  the  AN/UYK- 
7.  They  are  incidentally  addressable  through  references  in 
specific  fields  of  the  different  Format  instructions 
reserved  for  that  purpose. 


33 


C.   INSTRUCTION  FORMAT 

Instructions  of  the  central  processor  appear  in  five 
different  formats  according  to  their  operational  charac- 
teristics/ as  presented  in  Figure  III-l.  Formats  If  11/  and 
III  occupy  a  full/  32-bit  computer  word?  Formats  IV-A  and 
IV-B  each  occupy  a  half  computer  word.  Two  half-word  in- 
structions can  be  stored  in  one  memory  location.  to hen  a 
half-word  instruction  in  the  uoper  half  of  the  computer  word 
is  executed/  the  processor  sets  bit  15  of  the  ASR;  if  a 
whole-word  or  lower  half-word  is  executed  the  bit  is 
cleared.  In  the  Emulator*  this  bit  determines  whether  the 
subroutine  IFETCH  or  HALFFETCH  is  executed.  IFETCH  reads 
the  next  32-bit  instruction  from  memory.  HALFFETCH  shifts 
the  lower  half-word  of  the  current  instruction  into  the 
upper  halfword  position  for  execution. 

Each  of  the  five  formats  divide  the  instruction  into 
different  fields.  Each  field  except  "y"  (the  constant  or 
address  field)  has  a  particular  function  in  controlling  the 
various  internal  enables  and  commands  required  for  proDer 
execution  of  the  instruction.  Some  fields  define  the  use/ 
modification  or  application  of  the  y-field  to  secure  the 
desired  operand;  others  select  an  accumulator/  index/  or 
base  register;  others  select  an  IOC/  define  a  sub-function 
code/  or  combine  to  form  a  special  interpretation  defined  by 
the  instruction.  The  AN/UYK-7  maintains  a  repertoire  of  132 
central  processor  instructions  whose  specific  functions  are 
defined  in  detail  in  reference  26. 


3a 


Bit  No. 

FORMAT  I 

FORMAT  II 

FORMAT  III 


Bit  No. 
Bit  No. 

FORMAT  IV  A 

FORMAT  IV  8 


31--26 

25-23 

22-20 

19-17 

16 

15-13 

12 0 

f 

a 

k 

b 

s 

y 

f 

a 

f2 

b 

s 

V 

f 

i 

a 

f  3/k 

b 

s 

y 

31--26 
15—10 

25-23 
9-7 

22-20 
6-a 

19-17 
3-1 

16 
0 

f 

a 

fa 

b 

i 

f 

a 

m 

INDIRECT  CONTROL  WORD  FORMATS  (Indirect  Addressing) 


Bit  No. 


31-30 

29- 

25 

2a-20 

19-17 

16 

15-13 

12---0 

c 

w 

p 

b 

i 

s 

y 

c 

cl 

unused 

b 

i 

d 

Elements  of  the  word  are  interpretea  as  follows: 
FIELD       BASIC  DEFINITION 


t  i  o  n  code 

unc  t  i  on  code 

unc  t  i  on  code 

unc  t  i  on  code 

mulator  register  designator 

and  interpretation  designator 

t  count  designator 

x  register  designator 

rect  addressing  designator 

des  i  gnat  or 
ess  di sol acement /operand  designator 
ro 1  des  i  gnat  or 
rect  subfunction  designator 
acter  length  designator 
tion  indicator  for  character  length 
ess  displacement 


f 

6-bi  t 

f  unc 

f2 

3-bi  t 

subf 

f3 

2-bi  t 

subf 

fa 

3-bi  t 

sub  f 

a 

3-bi  t 

accu 

k 

3-bi  t 

ooer 

m 

6-bi  t 

shi  f 

b 

3-bi  t 

i  nde 

i 

1-bit 

i  ndi 

s 

3-bi  t 

base 

y 

13-bit 

addr 

c 

2-bi  t 

cont 

cl 

1-bit 

i  ndi 

w 

6-bi  t 

char 

p 

5-bi  t 

oos  i 

d 

16-bi  t 

addr 

INSTRUCTION  AND  INDIRECT  ADDRESS  WORD  FORMATS  [27] 


FIGURE  III-l 


35 


Of  particular  note  to  the  reaaer  is  the  K-Field  of  the 
Format  I  instructions.  The  value  of  K  Designates  whether 
the  operand  to  be  fetched/stored  is  a  whole*  half,  or 
quarter-word  operand/  as  depicted  in  Figure  III-2.  If  the 
value  of  K  implies  a  partial-word  operation,  then  it  also 
determines  which  portion  of  the  32-bit  word  is  to  be  ac- 
cessea.  That  is,  a  K-value  designating  a  auarter-word 
(byte)  transfer  can  also  specify  that  the  byte  is  located  in 
the  upDer,  lower,  or  one  of  the  intermediate  two  bytes  of 
the  4-byte,  32-bit  operand.  It  is  this  function  that  makes 
the  AN/UYK-7  an  extremely  powerful  word  processing  machine. 
This  function  was  fully  implemented  and  tested  in  the  Emula- 
tor. 


READ 
MEMORY  to  ARITHMETIC 

sy(SE)+B(b)  ->  A15-0CSE) 
Y15-0   ->  A15-0  (SE) 
Y31-16  ->  A15-0  (SE) 
Y31-0   ->  A31-0 
Y7-0    ->  A7-0  (ZE) 
Y15-8   ->  A7-0  (ZE) 

Y23-16  ->  A7-0  (ZE) 

Y31-24  ->  A7-0  (ZE) 


STORE 
ARITHMETIC  to  MEMORY 

NOT  USED 

A15-0  ->  Y15-0,*  Y31-16  unchg 
A15-0  ->  Y31-16; Y 15-0  unchg 
A31-0  ->  Y31-0 

->  Y7-0;Y3l-8  unchg 

->  Y 15-8;  Y31-16  unchg 
Y7-0  unchg 

->  Y23-l6;Y31-2a  unchg 
Y15-0  unchg 

->  Y31-24;  Y23-0  unchg 


A7-0 
A  7-0 

A7-0 


A7-0 


SE--sign  extended;  ZE--zero  extended 

A  is  the  ACCUMULATOR  specified  by  the  a-field 


FORMAT  I  INSTRUCTION  K-FIELD  INTERPRETATION  [27] 


FIGURE  1 1 1-2 


36 


D.   MODES  OF  OPERATION 

There  are  several  different  modes  of  operation  of  the 
AN/UYK-7;  most  of  them  are  concerned  with  different  address- 
ing techniques.  Specifically,  they  are:  normal  mode*  index 
mode,  repeat  mode,  and  indirection.  In  the  normal  mode,  the 
Y-Operand  address  is  calculated  as  the  sum  of:  the  y-offset, 
a  case  register  and  an  index  register,  or  Y=y+B (b ) +S ( s ) . 
There  are  two  exceptions  to  this  general  formula.  First,  if 
the  K-field  of  Format  I  instructions  is  a  zero  then 
Y=sy+B(b),  where  "sy"  is  the  concatenation  of  the  s-field 
and  y-field  of  the  instruction.  Second,  for  all  instruc- 
tions regardless  of  Format,  if  the  B-field  is'  zero  then  the 
B(b)  value  used  in  calculating  the  Y-Operand  aadress  is  al- 
ways zero.  There  are  several  additional  addressing  tech- 
niques employed  during  the  repeat  and  indirect  modes  of 
operation.  They  are  described  in  detail  in  Chapter  V. 
These  ad  hoc  addressing  techniques  employed  by  the  AN/UYK-7 
greatly  enhance  its  caoabilities  but  were  extremely  diffi- 
cult functions  to  emulate. 


37 


IV.   BURROUGH'S  D-MACHINE 


A.   GENERAL  DESCRIPTION 

An  Interpreter  Based  System  is  a  digital  processing  con- 
cept developed  by  Burrough's  Corporation/  that  utilizes 
hardware  building  blocks  which  can  be  tailored  through  mi- 
croprogramming to  perform  as  a  variety  of  general  purpose  op 
special  ourpose  general  processors  17/  8»  24].  The  basic 
Interpreter^  also  referred  to  as  the  D-^achine/  is  the  pri- 
mary building  block  of  this  uniaue  system.  It  is  composed 
of  five  functional  modules  each  of  which  can  be  modified  to 
manipulate  an  8  to  64-bit  word  format  in  increments  of  8 
bits.  In  the  Naval  Postgraduate  School  configuration,  two 
of  these  modules/  the  Nanomemory  and  the  Micromemory/  are 
combined  into  one.  The  register  sizes  given  in  the  follow- 
ing descriptions  of  the  modules  are  specific  to  this  confi- 
guration which  is  a  32-bit  O-Machine. 

1.   Logic  Unit  (LU) 

The  Logic  Unit  (LU)/  presented  in  Figure  IV-1/  con- 
tains all  the  registers/  the  Barrel  Switch  and  the  Adder 
which  are  available  to  the  m i c roorogrammer  for  manipulating 
data  fields  during  the  process  of  emulating  an  instruction. 
A  description  of  each  of  these  registers  and  its  functions 
fol lows  [8/24]  . 


38 


,— AMPCR 


F  rof  Memo ry 
Control  Unit  (MCU) 


L    Inputs 
CTR/ZEXT/LIT 


LOGIC 
UNIT  (LU) 


Al 


A2 


A3 


±_fc 


Hi 


B   * 


B  SELECT 


AOOER 


BARREL  SWITCH 


MIR 


Data  Output 
to  Memor  i  es 
and 
Peripheral  Devices 


Data  Input 
f  rom 

Memor  i  es 
and 

Peripheral 
Devices 


+  T0  Control  Unit  (CU) 
Dynamic  Conditions 


AOV/ABT/MST/LST 


_^To  Memory 

Control  Unit  (MCU) 


LIT/CTR/AMPCR 
BR1/BR2/MAR/SAR 


LOGIC  UNIT  (LU)  BLOCK  DIAGRAM 
FIGURE  I V-l 


39 


The  32-bit  registers  Al,  A2,  and  A3  are  functionally 
identical.  They  temporarily  store  data  within  the  Inter- 
preter and  serve  as  the  primary  (X)  input  to  the  adder.  Any 
A-Register  can  be  designated  as  a  destination  for  the  output 
from  the  Barrel  Switch. 

The  32-bit  B-Register  is  the  primary  external  input 
interface  (from  the  Switch  Interlock).  It  also  serves  as 
the  secondary  (Y)  input  to  the  Adder/  and  can  receive  the 
output  of  the  Adder/  in  addition  to  the  Barrel  Switch  which 
is  the  normal  source  for  the  results  of  arithmetic  calcula- 
tions. The  B-Register  can  be  the  destination  of  any  of  the 
following  during  execution  of  any  one  microinstruction: 

a.  The  Barrel  Switch  output. 

b.  The  Adder  output. 

c.  The  external  data  from  the  Switch 
Interlock. 

d.  The  Memory  Information  Register  (MIR). 

e.  The  carry  complements  of  four-bit  or 
eight -bit  groups. 

f.  The  Barrel  Switch  output  ORed  with  b/ 
c  /  o  r  d  above  . 

The  output  of  the  B-Register  has  true/complement 
selection  gates  which  are  controlled  in  three  separate  sec- 
tions: the  most  significant  bit  (MSB)/  the  least  significant 
bit  (LSB)/  and  all  the  remaining  internal  bits.  Each  of 
these  oarts  is  controlled  independently/  and  may  be  either 
all  one's/  all  zero's/  the  true  contents  or  the  one's  com- 
plement of  the  respective  bits  of  the  B-Register. 


ao 


The  32-bit  Memory  Information  Register  (MIR)  buffers 
the  information  which  is  to  be  written  to  main  system  S- 
Memory,  or  to  a  peripheral  device.  It  is  loaded  from  the 
Barrel  Switch  output  and  its  output  is  directed  either  to 
the  Switch  Interlock  or  the  B-Register. 

The  32-bit  Adder  in  the  LU  is  a  modified  version  of 
a  straightforward  carry  look-ahead  adder.  Inputs  to  the 
Adder  are  from  selection  gates  which  allow  various  combina- 
tions of  the  A,  S,  and  Z  inputs.  The  A  input  is  from  the 
A-Register  output  selection  aates  and  the  8  input  is  from 
the  B-Register  true/complement  selection  gates.  The  Z  input 
is  an  external  input  to  the  LU  and  can  be: 


a.  The  outout  of  the  counter  in  the  Memory  Con- 
trol Unit  (MCU)  into  the  most  significant 
eight  bits  with  all  other  bits  being  zeros. 

b.  The  output  of  the  literal  register  in  the 
MCU  into  the  least  significant  eight  bits 
with  all  other  bits  being  zeros. 

C.  An  optional  input  into  the  middle  bits  with 
the  most  and  least  significant  bytes  being 
zeros  . 

d.   All  zeros . 


There  are  always  two  inputs  to  the  Adder  referred  to 
as  the  X-input  and  Y-input.  An  X-input  may  have  A,  1,  or 
zero  as  its  source.  A  Y-input  may  have  8,  Z,  or  one  as  its 
source.  An  unspecified  X-input  is  always  assumed  to  be 
zero.  Using  various  combinations  of  the  possible  inputs  to 
the  selection  gates,  any  two  of  the  three  (A,  8,  or  Z)  in- 
puts can  be  added  together,  or  can  be  added  together  with  an 


41 


additional  one  added  to  the  least  significant  bit.  In  addi- 
tion, all  binary  Boolean  operations  can  be  performed  between 
any  t  wo  i  nput  s . 

The  32-bit  Barrel  Switch  is  a  matrix  of  gates  that 
shifts  a  parallel  input  data  word  from  the  Adder*  any  number 
of  places  to  the  left  or  right/  either  end-off  or  end- 
around.  The  output  of  the  Barrel  Switch  may  be  gated  to  one 
or  more  of  the  following  simultaneously: 

a.   The  A-Registers  (Al,  A2,  A3), 
b  .   The  B-Regi  st er . 

c.  Memory  Information  Register  (MIR). 

d.  Least  significant  16  bits  of  MCU  registers 
(BR1,  BR2,  MAR,  AMPCR,  CTR). 

e.  Least  significant  5  bits  to  the  Control 
Unit  (CU)  for  the  shift  amount  register 
(SAR). 

2.   Memory  Control  Unit  (MCU) 

One  MCU  is  required  for  an  Interpreter  to  have  ac- 
cess to  64K  of  main  memory  [8,  241.  The  addition  of  a  second 
MCU  is  possible,  thus  expandinq  on-line  memory  access  to 
128K.   The  MCU  has  three  major  sections: 


a.  The  microprogram  address  section  contains  a 
microprogram  count  register  (MPCR),  the 
12-bit  alternate  microprogram  count  regis- 
ter (AMPCR),  the  incrementer,  the  micropro- 
gram address  controls  register,  and  their 
associated  control  logic.  This  section  is 
used  to  address  the  Microprogram  Memory 
(MPM)  for  the  seauencing  of  microinstruc- 
tions. The  AMPCR  contents  may  be  used  as  a 
Y-inout  to  the  Adder. 


a2 


b.  The  memory/device  address  section  contains 
the  8-bit  memory  address  register  (MAR), 
the  two  16-bit  base  registers  BR1  and  BR2, 
the  output  selection  gates/  and  their  asso- 
ciated control  logic. 

c.  The  Z  register  section  contains  registers 
which  are  the  Z  inputs  to  the  LU  Adder:  a 
loadable  counter  (CTR),  the  literal  regis- 
ter (LIT),  selection  gates  for  the  loadable 
counter  and  their  associated  control  logic. 


3.   Control  Unit  (CU) 

The  Control  Unit  (CU)  has  five  major  sections:  the 
shift  amount  register  (SAR),  the  condition  register  (COND), 
part  of  the  control  register  (CR),  the  MPM  content  decoder 
and  the  clock  control  [8,  24]. 

The  functions  of  the  SAR  and  its  associated  logic 
are : 


a . 


b. 


To  load  shift  amounts  into  the  SAR  for 
in  (0  to  32-bit)  shifting  operations. 


use 


To  generate  the  required  controls  for  the 
Barrel  Switch  to  perform  the  shift  opera- 
tion indicated  by  the  current  microinstruc- 
tion. 

To  generate  the  "word  length  complement"  of 
the  SAR  contents*  where  the  "complement"  is 
defined  as  the  amount  that  will  restore  the 
bits  of  a  word  to  their  original  position 
after  an  end-around  shift  of  N  followed  by 
an  end-around  shift  by  the  " complement "  of 
N. 


43 


The  control  register  (CR)  is  a  56-bit  register  that 
stores  all  those  control  signals  from  the  current  microin- 
struction which  are  not  used  in  phase  I.  The  CR  is  divided 
into  the  phase  III  controls  and  the  MPAD  controls. 

The  condition  register  (COND)  section  of  the  CU  per- 
forms four  major  functions: 


a.  Stores  12  resettable  condition  bits  in  the 
condition  register.  The  12  bits  of  the 
condition  register  are  used  as  interrupts* 
error  indicators,  status  indicators,  and 
lockout  indicators. 

b.  Selects  1  of  16  condition  bits;  12  from  the 
condition  register  and  <4  dynamically  gen- 
erated during  the  present  clock  time  in  the 
Logic  Unit  for  use  in  oerforming  condition- 
a 1  operat  ions. 

C.  Decodes  bits  from  memory  for  resetting, 
setting  or  requesting  the  setting  of  cer- 
tain bits  in  the  condition  register. 

d.  Resolves  oriority  among  Interpreters  in  the 
setting  of  global  condition  (GC)  bits  which 
provide  a  facility  for  inter-Interpreter 
1 oc  kout  cont  rol  . 


4.   Microprogram  (M-Memory) 

The  Micromemory  (M-Memory),  also  known  as  the 
Nanomemory  (N -Memory)  in  the  Naval  Postgraduate  School  con- 
figuration, is  a  programmable  control  store  memory  which 
contains  the  user  suoDlied  microprograms  in  the  form  of  mi- 
croinstructions. Each  microinstruction  consists  of  a  56-bit 
nanoi nst ruct i on  and  provides  the  gating  for  functioning  of 
the  previously  discussed  LU ,  MCU,  and  CU  modules.  Mi- 
cromemory  consists   of  two  4K ,  56-bit,  modules  allowing  the 


aa 


programmer  access  to  approximately  8K  of  control  store.  The 
sequencing  of  microprogram  instructions  is  controlled  by  the 
following  procedure:  the  Nanomemory  provides  information  to 
the  condition  testing  logic  indicating  which  condition  is  to 
be  tested.  The  condition  testing  logic  provides  a 
TRUE/FALSE  signal  to  the  successor  logic  which  selects 
between  the  three  TRUE  and  three  FALSE  successor  bits. 
These  three  successor  bits  provide  eight  possible  successor 
command  combinations  which  are  listed  below  with  their  asso- 
ciated interpretations: 


a.  WAIT 

b.  STEP 

c.  SKIP 

d.  JUMP 

e.  RETN 

f.  CALL 

g.  SAVE 

h.  EXEC 


Repeat  the  current  instruction 

Step  to  the  next  Instruction 

Skip  the  next  instruction 

Jump  to  address  in  AMPCR 

Return  from  a  micro  subroutine 

Call  a  micro  subroutine 

Save  the  address  of  the  head  of 
a  1 oop . 

Execute  one  instruction  out  of 
sequence . 


The  particular  successor  command  specified  then  pro- 
vides the  controls  needed  in  the  selection  (MPCR/ AMPCR )  and 
incrementing  logic  to  generate  the  next  MpM  address.  Except 
for  the  EXEC  command  the  MPCR  is  loaded  with  the  MPM  ad- 
dress . 

For  a  more  thorough  description  and  discussion  of 
these   five   modules,   reference   10  provides  an  outstanding 


a5 


diagrammatic  breakdown  of  the  Interpreter's  internal 
hardware  configuration  and  operation.  Reference  7  discusses 
the  interface  of  various  Interpreter/  peripherals  and  memory 
configurations  that  have  been  tested  by  the  Advance 
Development  Organization  of  Burrough's  Defense  Space  and 
Special  Systems  Group. 

In  general*  there  are  three  data  processing  func- 
tions to  which  the  Interpreter  may  be  applied:  emulation  of 
existing  or  hypothetical  machines;  direct  execution  of  high 
level  languages?  ana  problem  solution  through  microprogram 
"tuning"  of  the  machine  to  the  problem.  The  initial  goal 
for  the  installation  at  the  Naval  Pos t araduat e  School  is 
emulation  of  existing  machines  such  as  the  AN/UYK-7,  with 
further  expansion  and  development  as  a  teaching  tool  in  the 
areas  of  operating  systems/  file  management/  compiler  writ- 
ing/ and  emulation  of  hypothetical  systems. 


46 


B.   NAVAL  POSTGRADUATE  SCHOOL  CONFIGURATION 

1 .   Desc  r  i  pt  i  on 

The  system  presently  installed  at  the  Naval  Postgra- 
duate School  consists  of  three  Interpreters*  one  64K  memory 
module?  a  card  reader*  line  printer  and  dual  cartridge  disk. 
Only  one  of  the  three  Interpreters  is  allowed  to  communicate 
directly  with  any  Deripheral  and  is  discussed  below  under 
I/O  Interface.  Figure  IV-2  represents  the  present  confi- 
guration; however*  future  expansion  calls  for  the  addition 
of  a  supervisor's  console  and  a  cross-connection  with  the 
school's  PDP-11/45.  This  will  enhance  the  attached  peri- 
pherals by  three  tape  drives  and  greatly  increase  the  amount 
of  on-line  storage  to  the  point  where  implementation  of  a 
CMS-2  Compiler  may  be  feasible. 

When  the  system  is  energized  and  initialized  daily* 
its  basic  mi c rost rue t ure  is  that  of  two  B-6700  LIFO  ALGOL 
Stack  Machines  -  each  with  32K  of  memory  -  attached  to  a 
single  Inout/OutDut  Processor.  The  system  is  caDable  of 
pseudo-multiprocessing  in  this  configuration.  ALGOL  pro- 
grams submitted  through  the  card  reader  are  executed  in  a 
batch  mode  with  the  two  processors  competing  to  fetch  the 
next  job.  All  utiltiy  programs*  the  operating  system  and 
the  file  manager  are  executed  with  the  machine  in  this  con- 
figuration. In  order  to  change  the  machine's  configuration* 
the  user  must  alter  the  microcode  in  order  to  execute  the 
desired  machine  such  as*  the  AN/UYK-7. 


47 


L 


Loader 


Loader 


Loader 


Mi  c  ro/Nano 
Memory 


Di  spl ay 
Card 


Mi  c  ro/Nano 
Memory 


Display 
Card 


Interpreter 


C  1  ock 
Cont  rol 
Processor 
Loc  k  i  ng 


M  i  c  ro/Nano 
Memory 


Display 
Card 


Interpreter 


Oi  sk 
OOP 


Swi  tch 
Interlock 


Di  sk 


System 
Memo  r y 


System 
Memory 


Interpreter 


I 


Port  Select 
Uni  t 


J^t 


Printer 
DDP 


Card  Rdr 
DDP 


L  i  ne 
Printer 


Card 

Reader 


NAVAL  POSTGRADUATE  SCHOOL  THREE  INTERPRETER  SYSTEM 


FIGURE  IV-2 


48 


2.  I/O  Interface 

Since  only  one  Interpreter  (IOP)  is  allowed  to  ex- 
change data  directly  with  the  peripherals/  it  is  necessary 
for  the  remaining  two  processors  to  communicate  their  I/O 
requests  to  the  IOP.  This  is  done  by  the  Interpreter  plac- 
ing a  message  in  address  64K  otherwise  known  as  the  "Mail- 
box", and  then  issuing  an  interrupt  (INT)  to  the  IOP.  The 
IOP  periodically  tests  for  INT  and  when  sensed,  reads  the 
Mailbox,  decodes  the  message,  and  performs  the  predefined 
function.  After  completing  its  task,  the  IOP  places  a  mes- 
sage in  the  Mailbox  informing  the  requesting  Interpreter 
whether  or  not  the  I/O  was  performed  successfully.  The  IOP 
then  issues  an  INT  to  the  Interpreter  which  sent  the  re- 
guest.  When  the  reguesting  Interpreter  receives  the  INT,  it 
reads  the  Mailbox  to  determine  whether  its  reouest  was  per- 
formed and  continues  accordingly.  This  method  allows  the 
two  Interpreters  to  act  completely  independently,  each  re- 
ferencing only  its  assigned  segment  of  memory  and  the  IOP 
performing  all  I/O  asynchronously  upon  reauest. 

3.  Memory  Interface 

The  memory  module  consists  of  a  single  ported,  6  4  K , 
32-bit  word,  core  memory,  which  is  the  equivalent  of  256K  of 
on-line,  «-bit  character  storage.  Access  to  this  single 
memory  is  through  a  Switch  Interlock  Unit  (SwI)  which  makes 
memory  appear  to  be  multiported  to  the  user.  The  SWI  acts 
on   a  priority  basis  with  that  Interpreter  having  the  lowest 


a9 


number  (the  IOP)  given  the  highest  priority.  Once  an  Inter- 
preter issues  a  memory  read/write  reference/  it  may  continue 
execution  and  need  not  wait  on  a  memory  completion  signal. 
However/  the  memory  address  register  (MAR)  on  a  Read/Write* 
and  the  Memory  Information  Register  (MIR)  on  a  write/  should 
not  be  changed  until  a  completion  signal  is  received.  Thus 
a  mi c roprogramme r  who  anticipates  his  memory  accesses  and 
intersperses  these  instructions  among  the  other  code/  should 
never  have  a  delay  caused  by  memory  referencing. 

C.   INSTRUCTION  TIMING 

The  Interpreter  uses  a  one  megahertz  clock  and  initiates 
a  new  microinstruction  every  microsecond.  The  Interpreter 
enhanced  with  Emitter  Coupled  Logic  (ECL)  and  a  higher  speed 
memory  can  operate  off  an  8  Megahertz  clock.  A  correspond- 
ing 8-fold  improvement  in  execution  times  can  be  expected. 

There  are  two  basic  instruction  types  in  the  Inter- 
preter. Type  I  uses  two  phases  (I  and  III)  for  execution; 
although/  its  phase  III  may  be  held  in  abeyance  until  com- 
pletion of  a  subseauent  Type  11/  which  always  uses  only 
phase  I  to  complete.  Phase  I  of  the  following  Type  I  in- 
struction always  overlaps  Phase  III  of  the  previous  Type  I. 
Type  I  instructions  involve  condition  testing/  external 
functions  and  Adder/Logic  operations.  Type  II  instructions 
involve  literal  assignments  to  one  of  three  registers  (LIT, 
SAR  and  AMPCR).  Appendix  0  of  reference  9  contains  an  ex- 
cellent discussion  of  instruction  timing. 


50 


D.   LANGUAGES 

The  D-Machine  has  two  resident  programming  languages: 
the  language  of  the  operating  system,  ALGOL;  and  the  mi- 
croprogram assembly  language*  TRANSLANG. 

1.   ALGOL 

The  resident  programming  language  of  the  Burrough's 
D-Machine  is  the  ALGOL  60  Language  enhanced  with  additional 
language  constructs  which  oermit  manipulation  of  data  in  the 
form  of  character  strings.  ALGOL  employs  a  vocabulary  of 
reserved  words  and  symbols.  The  structure  of  the  language, 
syntax,  reserved  words  and  symbols,  and  additional  features 
of  the  ALGOL  implemented  on  the  D-Machine  are  discussed  in 
reference  10.  The  accepted  character  set  for  ALGOL  varies 
depending  on  the  machine  used  and  the  character  set  or  sets 
available  on  the  machine.  The  Naval  Postgraduate  School 
configuration  reguires  that  all  characters  be  converted  from 
EBCDIC  into  the  6-bit  Burrough's  Common  Language  (BCD  for- 
mat for  recognition  by  ALGOL.  This  conversion  is  performed 
by  the  I0P  when  it  is  used  for  interfacing  communications 
from  external  devices  to  the  other  Interpreters.  When 
information  is  directed  to  an  external  device  the  IOP 
performs  a  reverse  conversion,  from  BCL  to  ASCII.  Thus  all 
inputs  to  the  emulator  from  oeripherals  are  8-bit  characters 
containing  a  6-bit  BCL  code.  The  Interpreter's  file 
management  routines,  operating  system  and  utilities  are 
written  in  ALGOL,  for  execution  on  the  ALGOL   Stack   Machine 


51 


configuration.  ALGOL  source  modules  mav  be  inputted  to  the 
ALGOL  Compiler  from  disk  or  caras.  Object  modules  are 
placed  in  user  libraries  on  disk  for  future  execution  by  the 
stack  machine.  The  operating  system  (MCP)  will  load  specif- 
ic object  modules  for  execution  when  it  recognizes  a  H?RUN 
filename"  control  card  *  where  filename  is  assumed  to  be  a 
precompiled  ALGOL  program. 

2.   TRANSLANG 

The  mi c roprogramme r  is  aided  in  producing  micropro- 
grams by  a  Mi c rot ransl at or/Assemb 1 er  that  translates  symbol- 
ic instructions  written  in  TRANSLANG  into  microinstructions. 
Reference  9  describes  the  structure  of  TRANSLANG  by  defining 
its  syntax  and  semantics*  and  presenting  a  series  of  exam- 
ples. The  reference  also  includes  descriptions  of  register 
state  changes  resulting  from  executing  microinstructions. 
Interoreter  controls  and  timing  are  explained.  Coding  tech- 
nigues  and  conventions  are  discussed  via  sample  programs. 
The  reference  analyzes  external  operations  with  main  memory 
and  perioheral  devices*  and  the  coordination  and  control  of 
multiple  Interpreters  via  the  Switch  Interlock  and  global 
condi  t  i  on  bits. 

The  Mi c rot rans 1  at  or  is  written  in  ALGOL  for  the  0- 
Machine.  It  is  written  modularly  with  each  function  setup 
as  a  procedure  call.  The  language*  TRANSLANG*  used  ALGOL  as 
a  model*  however*  almost  the  entire  language  is  composed  of 
reserved  words.   Reserved  words  have  very   specific   meaning 


52 


to  the  translator  and  cause  specific  nano  instructions  to  be 
develooed.  TRANSLANG  is  free  form  and  each  instruction  may 
be  written  in  almost  any  order?  however/  multiple  instruc- 
tions appearing  on  the  same  line  or  card  must  be  separated 
by  a  period.  Each  TRANSLANG  instruction  corresponds  to  one 
microinstruction;  which  is  the  set  of  Interpreter  functions 
performed  in  parallel  at  each  machine  clock.  The  constructs 
provided  include  iterative  mechanisms*  I/Of  Boolean,  logical 
and  computational  operations/  control  transfers/  and  assign- 
ment functions.  In  order  to  provide  control  points  for 
transfer  operations/  each  instruction  may  be  labeled  with  a 
symbolic  M-Address.  The  output  module  of  the  M i c ro t rans 1 a- 
tor  is  placed  on  aisk  and  when  loaded  into  micromemory/ 
alters  the  basic  machine  configuration.  Reference  9  is  used 
as  the  m i c roprogramme r ' s  programming  manual/  although/ 
there  have  been  several  enhancements  to  the  machine  and 
language  which  are  not  included  in  the  manual.  These  modif- 
ications are  discussed  in  Apoendix  A  of  this  thesis. 


53 


V.   PROJECT  DESCRIPTION 


The  AN/UYK-7  achieves  its  speed  and  versatility  par- 
tially through  concurrent  field  utilization  and  partially 
through  the  provision  of  special  and  general  purpose  regis- 
ters. Its  emulation  is  complicated  by  the  various  modes  of 
instruction  operation  (repeat*  indirection/  indexing)  and  in 
particular  by  the  use  of  ad  hoc  addressing  techniques.  The 
fact  that  the  AN/UYK-7  performs  many  of  its  operations  in 
parallel  makes  it  difficult  for  an  emulation  which  is  imi- 
tating one  facility  at  a  time  to  run  in  AN/UYK-7  real-time. 
For  the  remainder  of  this  discussion  the  acronyms  A(a)/  B(b) 
and  S(s)  refer  to  the  Accumulator,  Inaex  and  Base  registers* 
respectively.  The  subscripts  (a*  b*  and  s)  correspond  to 
the  register  specif  i  e  o  in  the  cognizant  field  of  the  in- 
struction* and  may  assume  values  of  0  to  7.  CaDitol  "Y" 
refers  to  the  effective  18-bit*  operand  address;  small  "  y  " 
refers  to  the  13-bit*  y-field  of  the  instruction.  The  com- 
bination sy-field  is  formed  by  concatenation  of  the  3-bit* 
s-field  and  13-bit*  y-field  of  the  instruction  and  forms  an 
alternate  operand  address. 

During  the  initial  analysis  of  the  Emulation  it  was  de- 
cided to  separate  the  project  into  the  following  phases: 

First*  the  machine  would  be  designed  to  accommodate  a 
full    emulation   includinq   multiprogramming   and   all   IOC 


5a 


functions.  This  required  that  all  registers  and  condition 
bits  of  the  actual  AN/UYK-7  hardware  be  mapped  into  the 
model*  even  if  they  would  not  be  used  during  this  partial 
Emu  1  at  i  on • 

Second/  it  was  decided  to  divide  the  Instruction  Reper- 
toire into  the  followinq  groups: 


a.  Those  instructions  that  could  be  emulated  im- 
mediately ana  tested  completely;  such  as/  all 
Format  I's  and  II's  except  Multiply*  Divide* 
Square  Root  and  Double  Register  Operations. 

b.  Those  instructions  that  could  be  done  prior  to 
completion  but  for  which  there  might  be  insuf- 
ficient time  for  complete  testing;  such  as*  all 
Format  Ill's*  Shifts*  Multiply*  Divide*  and 
Double  Register  Operations. 

c.  Those  special  instructions  and  functional  modes 
that  would  be  incorporated  if  at  all  possible; 
such  as*  indirection  and  repeat. 

d.  Those  features  for  which  there  would  definitely 
be  insufficient  time  for  incorporation;  such 
as*  Interrupts*  IOC  Instructions*  and  Floating 
Point  Ooerat  ions. 


Third*  a  "Loader"  program  which  could  reaa  AN/UYK  —  7 
instructions  from  cards*  decode  them  and  place  the  results 
into  memory  for  execution  by  the  Emulator  was  mandatory. 

Fourth,  some  facility  for  monitoring  and  debugging 
each  instruction  as  it  is  executed  by  the  Emulator  would  be 
requ  i  red . 


55 


Fifth/  some  facility  to  output  the  results  of  each 
AN/UYK-7  program  and  to  input  test  data  was  needed. 

To  accomplish  these  five  tasks*  two  basic  programs 
called  the  "Loader"  and  the  "Emulator"  were  written.  Each 
of  these  programs  occupied  its  own  Interpreter  whenever  the 
system  was  reconfigured  as  an  AN/UYK-7. 

A.   LOADER 

The  Loader  was  written  in  TRANSLANG  and  fulfilled  the 
third/  fourth  and  fifth  reau i rement s /  that  is»  it  served  as 
a  combination  loaoer,  deougger  and  IOC  monitor.  Its  use  is 
described  in  Appendix  A,  the  User's  Manual  section  of  this 
thesis.  In  general/  the  loader  portion  of  the  program  acts 
like  a  pseudo-assembler.  It  has  macros  for  defining  a  con- 
stant or  character  string/  for  saving  space/  for  initializ- 
ing registers  and  switches/  and  for  inputting  instructions. 
The  loader  will  accept  one  instruction  per  card  and  deter- 
mine whether  it  is  a  Format  (1/  11/  III/  I  V  -  A  /  or  IV-B)  in- 
struction. Based  on  this  determination/  the  Loader  will 
decode  the  specified  fields  from  the  card  and  generate  a 
binary  instruction  which  is  placed  in  the  next  sequential 
location  in  the  user's  memory.  Upon  detecting  an  "N"  card/ 
the  loader  portion  of  the  program  signals  the  Emulator 
which  is  resident  in  the  alternate  Interpreter  -  that 
instructions  are    available  for  execution. 


56 


At  this  point  the  loader  function  ceases  ana  the  program 
can  be  called  upon  by  the  Emulator  to  act  as  a  debugqer  or 
as  an  IOC.  As  a  debugger,  the  Loader  can  be  used  to  gen- 
erate a  number  of  error  messages  to  the  operator*  or  to  pro- 
vide an  actual  dump  of  control  memory  registers  000  to  035, 
which  includes  all  Task  Registers,  the  PAR  and  the  Active 
Status  Bits.  As  an  IOC,  the  Loader  can  be  called  upon  to 
read  a  card,  print  a  buffer,  or  read  the  disk. 

It  should  be  emphasized  that  the  Loader  was  written 
strictly  as  a  tool  to  assist  in  the  development  and  testing 
of  the  Emulator.  Presumably,  once  a  full  emulation  is  writ- 
ten and  tested,  the  IOC  functions  will  be  incoroorated  into 
the  Emulator,  while  the  loader  and  debugger  functions  will 
be  either  written  in  ANl/UYK-7  Machine  Language,  or  absorbed 
by  the  Emulator.  When  this  is  done,  the  Interpreter  previ- 
ously utilized  by  the  Loader  will  be  free  for  loadina  as  a 
second  AN/UYK-7,  and  a  true  multiprocessing  environment 
could  be  created.  A  cooy  of  the  Loader  is  Drovided  in  Ap- 
pendi  x  C . 

B.   EMULATION  PROGRAM 

The  Emulator  was  written  in  TRAM SLANG  microcode,  and   is 

loaded  directly   into   the   Interpreter's   micromemory  from 

disk.  A  cooy  of  the  Emulator  is  provided   in   Appendix   B. 

Overall  program  flow  for  the  Emulator  is  presented  in  Figure 
V-l  . 


57 


A 


iCl 


no 


yes 


Fetch  Next 
Instruction 


Isolate  Opcode 


no 


yes 


Isolate  "B" 

Index  Field 


Branc  h  to 
Oocode  Subroutine 


-f 


rs 


Print  "ILLEGAL 
Inst  rue  t  i  on 


Isolate  Lower 
Ha  1  f word 


OVERALL  PROGRAM  FLOW 


FIGURE  V-l 


58 


Besides  the  necessary  Control  Memory  Registe'r  mappings, 
it  was  necessary  to  minimize  memory  references  by  maintain- 
ing certain  frequently  used  information  in  the  D-Machine's 
internal  registers.  For  this  reason,  the  PAR  is  maintained 
in  the  lower  20  bits  of  the  D-Machine's  A2  register.  The 
upper  12  bits  of  fl2  are  used  to  maintain  some  of  the  most 
frequently  referenced  bits  of  the  AN/UYK-7's  Active  Status 
Register  as  listed  in  Table  V-l. 


ASR  Bit 

A2  6i  t 

Func  t  i  on 

2 

1 

0 

3 

8 

9 

10 

1  1 

N/A 

N/A 

15 

N/A 

31 

30 
29 
28 
27 
26 
25 

2a 

22-23 

21 
20 

0-19 

Equa 1 /Unequa 1 

Greater  Than/Equal 

Limits 

Fixed  PT  Overflow 

Task  use  of  05-a 

Remove  Interrupt  Lockouts 

Int/Task  Accumulators 

Int/Task  Base  Regs. 

0  1  =  I nd  i  rec  t  i  on 

10  =  Optional  Indirection 

11  =  Character  Addressing 
Repeat  Mode 

Halfword  Indicator 
PAR 

ACTIVE  STATUS  REGISTER 
TABLE  V-l 

The  remaining  bits  in  the  ASR  are  not  used  in  this  Emu- 
lation, but  if  needed  could  be  mapped  into  any  unused  loca- 
tion in  memory  below  address  102a. 

The  D-Machine's  Al  reqister  is  used  to  maintain  a  copy 
of  the  instruction  currently  being  executed.  All  other  re- 
gisters are    free  for   computational   use.    The   D-Machine's 


59 


General  Condition  Bit  One  (GC1)  is  reserved  for  communicat- 
ing with  the  Loader.  General  Condition  Bit  Two  (GC<?)  is 
used  to  indicate  that  an  AN/UYK-7  instruction  is  being  exe- 
cuted under  a  special  condition;  such  as,  repeat  mode  or  in- 
di  rect i  on  . 

The  Emulator  consists  of  an  Opcode/Sub-oocode  Directory/ 
an  instruction  fetch  routine  (IFETCH),  global  subroutines 
and  opcode  execution  subroutines.  When  the  Emulator  re- 
ceives a  signal  from  the  Loader  (GC1)  to  commence  excut ion> 
it  immediately  passes  control  to  IFETCH,  which  reads  the  PAR 
and  places  the  first  instruction  in  Al.  The  opcode  portion 
of  the  instruction  is  isolated  and  used  as  a  pointer  into 
the  Opcode  Directory.  Control  is  then  passed  to  the  opcode 
execution  subroutine  designed  to  handle  that  particular  in- 
struction. The  opcode  subroutines  may  stand  alone  and  per- 
form their  functions  independently?  or  they  may  call  several 
global  subroutines  used  to  consolidate  code  for  multiple  op- 
codes. Upon  completion  of  its  execution*  the  opcode 
subroutine  oasss  control  back  to  IFETCH  which  then  fetches 
the  next  instruction. 

In  the  case  of  halfword  instructions*  control  is  passed 
to  HALFFETCH  which  serves  the  same  purpose  as  IFETCH,  except 
for  16  bit  instructions.  Every  attempt  is  made  within  the 
opcode  subroutines  to  do  in-line  coding  versus  subroutine 
calls.  This  decreases  execution  time  considerably; 
although,  it  greatly  increases  program  size.  During  the  in- 
itial orogrammina  phase  the  Interpreters  were  limited   to   a 


60 


4  K  micromemory  due  to  the  dynamic  overlay  routine  (SMX)  be- 
ing positioned  at  4k.  As  a  result*  excessive  subroutine 
calls  were  necessary  in  order  to  keen  the  program  size  below 
4K.  This  software  deficiency  has  since  been  corrected  by 
Burrough's  and  a  full  8K  micromemory  is  now  available. 
These  subroutine  calls  could  now  be  removed  and  the 
subroutines  moved  back  in-line. 

Emulation  of  Central  Processor  instructions  in  the 
AN/UYK-7  repertoire  was  fairly  straightforward.  Most  in- 
structions were  implemented  with  an  average  of  15  microin- 
structions. This  generally  included:  isolating  the  various 
fields/  forming  the  effective  operand  (Y)  address*  fetching 
the  operands  from  main  memory/  performing  the  instruction 
function^  and  writ  ino  the  result  back  to  main  memory/  com- 
monly referred  to  as  S-Memory.  Because  of  the  parallelism 
of  the  D-Machine's  nano i nst rue t i ons  several  of  these  func- 
tions were  performed  simultaneously.  M  a  n  y  AN/UYK-7  instruc- 
tions have  sub-opcodes/  each  of  which  perform  a  different 
operation  on  the  same  operands.  In  such  cases/  the  opcode 
subroutine  centralized  code  by  performing  the  field  isola- 
tion and  operand  fetch  functions  prior  to  calling  the  sub- 
opcode  subroutine.  Either  the  ooerand  itself  or  its  address 
was  passed  in  a  register  to  the  subroutine/  which  then  per- 
formed its  function  and  wrote  the  results  back  to  S-Memory. 

The  difficulties  arose  in  the  AN/UYK-7  Emulation  when 
the  repeat  and  indirection  modes  of  operation  were  imple- 
mented.  The   Repeat   Instruction   reguired   that   the   next 


61 


sequential  instruction  be  executed  the  number  of  times  con- 
tained in  the  Index  Register  6(7),  or  until  specified  alter- 
nate conditions  were  met.  This  required  that  flags  be  set 
indicating  that  the  repeat  mode  had  been  initiated  and  that 
special  termination  conditions  were  to  be  tested.  Condition 
testing  took  place  after  each  execution  of  the  repeated  in- 
struction and  prior  to  return  to  IFETCh  for  the  next  in- 
struction. If  the  conditions  were  not  satisfied  IFETCH  was 
bypassed  and  the  same  instruction  was  reexecuted  after  first 
decrementing  B(7),  and  then  indexing  the  ooerand  address  by 
the  displacement  value  contained  in  the  repeat  instruction. 
If  the  conditions  were  met  the  normal  IFETCh  mode  was  exe- 
cuted and  the  repeat  mode  was  terminated.  Most  instructions 
requirea  checking  the  condition  of  a  specified  accumulator 
register  to  signal  completion  of  the  repeat  mode;  however, 
compare  instructions  used  the  results  of  their  comparison  to 
signal  completion.  Repeated  replace  instructions  used  a 
different  Y-ooerand  calculation  for  their  store  phase  then 
for  their  fetch  phase.  Instructions  that  were  not  designat- 
ed as  being  repeatable  were  executed  once  and  the  repeat 
mode  was  terminated.  A  copy  of  the  Reoeat  Instruction  was 
saved  in  S-Memory  at  address  0030;  a  copy  of  the  instruction 
beina  repeated  was  saved  at  address  0031;  and  the  Y-operand 
address  used  for  storing  during  a  repeated  replace  instruc- 
tion was  saved  at  0033.  These  addresses  are  given  in  octal 
and  are  normally  unused  in  the  AN/UYK-7. 


62 


The  indirect  modes  of  operation  possible  in  the  AN/UYK-7 
were  extremely  difficult  to  emulate.  There  are  four  modes 
of  inairection  possible:  Normal  Indirection,  Character  Ad- 
dressing, Sequential  Character  Addressing,  and  Optional  In- 
direction. Not  all  instructions  are  indirectable  and  some 
instructions  are  indirectable  but  not  character  addressable. 
To  make  this  determination  a  table  was  created  in  the  Emula- 
tor which  would  return  a  value  based  on  the  instruction  op- 
code. This  value  indicates  whether  an  instruction  is  re- 
peatable*  indirectable,  or  character  addressable.  All  mooes 
of  indirection  are  initially  signalled  by  the  i-field  of  the 
instruction  being  a  one.  This  indicates  that  the  Y-operand 
points  to  an  Indirect  Control  Word  (ICW).  The  ICW,  which  is 
presented  in  Figure  III-l,  is  then  fetched  and  its  bits  30- 
31  are  examined  to  determine  the  indirection  mode.  In  all 
cases,  if  the  i-field  of  the  I C  w  is  set,  the  Y-operand  again 
points  to  a  new  ICw.  The  Y-operand  is  calculated  in  accor- 
dance with  the  indirect  mode.  Operand  fetching  will  contin- 
ue in  this  manner,  cascading  through  memory,  until  an  ICW  is 
found  without  its  i-field  set.  At  this  point  the  lower  2  0 
bits  of  the  ICrt  replaces  the  lower  20  bits  of  the  original 
i  nst  rue t  i  on  . 

Normal  indirection  is  indicated  by  a  binary  10  in  bits 
31-30  of  the  ICW.  Y-ooerand  address  calculation  is  per- 
formed as  Y=y+B (b) +S ( s ) .  Once  the  final  ICw  is  determined 
then  normal  execution  of  the  instruction  resumes. 


63 


Single  Character  Addressing  is  indicated  by  a  binary  01 
in  bits  31-30  of  the  I C  W .  Y-ooerand  address  calculation  is 
performed  as  Y=y+6 (b) +S ( s ) ;  however*  in  this  mode  two  addi- 
tional fields  (P/rt)  of  the  I C  W  are  meaningful.  The  P-field 
indicates  the  least  significant  bit  position  of  the  charac- 
ter to  be  fetched  from  the  operand  and  the  W-field  indicates 
the  number  of  bits  in  the  character.  When  the  character  is 
fetched  -  it  is  right  justified;  operated  on  in  accordance 
with  the  instruction;  and  then  (deoendinq  on  the  instruc- 
tion) ORed  back  into  its  original  position  in  the  Y-operand. 

Seguential  Character  Addressing  indicated  by  a  binary  11 
in  bits  31-30  of  the  I C W ,  operates  in  exactly  the  same 
manner  as  Single  Character  Addressing  except  in  the  case 
where  the  store  cycle  is  reguired.  Before  ORing  the  result- 
ing character  back  into  the  Y-operana  the  P  and  w-fields  are 
compared.  If  P  minus  W  is  positive  then  the  difference  re- 
places P  and  the  character  is  stored  accordingly.  If  the 
difference  is  negative  then  32  minus  IN  replaces  P  and  the 
"svH  field  of  the  I C  .^  is  incremented  by  1  and  replaced  in 
memory  for  the  next  execution. 

Optional  Indirection  is  indicated  by  a  binary  00  in  bits 
31-30  of  the  ICW.  In  this  mode  bit  29  of  the  ICW  is  also 
significant  and  modifies  the  Y-ooerand  address  calculation. 
If  bit  29  is  0  then  Y=sy+S(b).  If  bit  29  is  1  then 
Y=sy*B(b)+(S) ,  where  S  is  designated  by  bits  17-19  of  B(b). 
Once  the  first  operand  is  fetched  then  normal  instruction 
execution  occurs. 


6a 


A  large  portion  of  the  Emulation  code  was  devoted  to 
handling  the  four  modes  of  indirection  and  its  ad  hoc  ad- 
dress calculations.  General  Condition  Bit  2  (GC2)  was  used 
to  flag  the  indirect  and  repeat  modes  of  operation.  Address 
0  0  32,  octal f  in  S-Memory  was  reserved  for  saving  the  current 
ICw  being  used  during  Character  Addressing;  address  0033, 
octal,  was  reserved  for  the  Y-operand  address  in  the  case  of 
optional  indirection;  address  0034,  octal,  was  reserved  for 
the  address  of  the  current  ICW  which  could  be  updated  during 
seguential  character  addressing.  These  addresses  are  part 
of  the  Control  Memory  Registers  and  are  not  normally  used  in 
the  AN/UYK-7. 

Although  the  IOC  has  not  been  emulated,  Input/Output 
functions  were  implemented  which  make  the  systems'  peri- 
pherals accessible  to  the  user.  The  AN/UYK-7  Initiate  I/O 
instruction  was  implemented  in  the  Emulator  with  the  excep- 
tion that  the  a-field,  which  is  normally  used  as  a  channel 
designator,  actually  Designates  the  desired  peripheral. 
Based  on  the  contents  of  the  a-field,  a  function  code  is 
formulated  and  passed  to  the  IOC  portion  of  the  Loader.  The 
Emulator  then  enters  a  neutral  state  awaiting  an  Interrupt 
from  the  Loader  that  the  I/O  has  been  performed.  The  Y- 
operand  address  of  the  I/O  instruction  fetched  by  the  Emula- 
tor points  to  the  address  of  the  buffer,  rather  than  to  a 
Duffer   control  word  as  in  the   AN/UYK-7.   It  was   felt  that 


65 


implementation  of  I/O  in  this  manner  would  remain  virtually 
transparent  to  the  user,  and  would  facilitate  full  emulation 
of  IOC  functions  at  a  later  date. 

Of  the  132  instructions  in  the  AN/UYK-7  Repertoire*  111 
have  been  fully  implemented  and  tested.  One  instruction 
(Return  Jump)  has  been  implemented  but  not  tested.  Twenty 
instructions  remain  to  be  both  written  and  tested.  All 
unwritten  instructions  were  assigned  space  in  the  Opcode 
Directory  and»  if  used  by  the  programmer,  will  cause  an  er- 
ror message  to  be  printed  to  the  effect  that  the  instruction 
has  not  been  yet  implemented.  The  implementation  of  these 
instructions  involves  developing  the  required  microcode  and 
inserting  it  into  the  soace  already  allocated  in  the  Opcode 
Subroutine  Library.  The  un i mpl ement ed  instructions  include 
all  Floating  Point  Operators,  Scale  Factor,  and  Interrupt 
Hanoi ers . 

The  Repeat  Instruction  and  its  associated  mode  of  opera- 
tion have  been  imolemented  and  tested  with  the  exception  of 
the  repeat  replace  instructions,  which  have  been  written  but 
not  yet  tested.  Indirect  addressing  has  been  fully  imple- 
mented but  has  not  been  tested.  Input/Output  functions  of 
the  IOC  have  been  implemented  and  tested  allowing  the  user 
to  read  a  card,  print  a  buffer,  or  read  a  disk  sector.  The 
disk  write  function  has  been  designed  into  the  Emulator  but 
not  imolemented  for  fear  of  destroying  resident  disk  materi- 
al during  execution.  This  function  should  not  be  fully  em- 
ployed until  either  a   monitor   svstem   is   developed   which 


66 


would  DPeclude  write  access  to  assigned  disk  sectors*  or  the 
assumption  is  made  that  the  entire  disk  is  available  to  the 
user  as  a  scratch  pad. 

C.   REGISJER  MAPPING 

Because  the  D-Machine  has  few  registers  available  to  the 
user*  the  authors  chose  to  mao  all  of  the  AN/UYK-7  registers 
into  main  memory.  In  addition*  it  was  necessary  to  create 
several  special  locations  to  hold  temporary  results  or  con- 
ditions. In  order  to  facilitate  this  mapping,  all  memory 
locations  below  1024  decimal  are  reserved?  thus*  all  user 
instructions  and  memory  references  were  offset  by  this 
amount  by  the  Loader.  Since  this  Emulation  will  be  in  a 
monoprogramming  environment*  all  Base  Registers  were  ini- 
tialized in  increments  of  8K  with  the  first  Base  Register 
set  to  \0dU.  This  allowed  user  access  to  approximately  63K 

of  main  memory*  with  each  Base  Register  referencing  an  8K 
page  of  memory.  The  Control  Memory  Register  (C^R)  alloca- 
tions and  additional  temporary  mappings  (indicated  by  an  *)» 
are  presented  as  part  of  Figure  V-2.  The  registers  marked 
"*M  are  not  used  in  the  AN/UYK-7*  and  were  thus  assigned 
special  purposes  in  the  Emulator.  Additional  unused  regis- 
ter areas  are  available  and  labelled  "unused"  in  Figure  V-2. 
These  register  areas  could  be  employed  for  the  same  purposes 
if  needed  in  the  course  of  expansion  to  a  full  emulation. 


67 


OCTAL 
ADDRESS 


DECIMAL 
ADDRESS 


DESCRIPTION 


0-7 

10 

11-17 

20-27 
*30 
*31 

*32 

*33 

*34 

*35 
36-57 
60-67 

70-77 
100-107 
1  10 

111-117 
120-127 
*  1  30 
131-137 
iaO-157 
160-167 

170-177 

*200 

*201 

*202-2U6 

*247-323 

*324-357 

360-365 
*366-426 

427-437 

*aao-i777 

2000-77775 
*77775-77776 


0-7 
8 

9-15 
16-23 

2a 

25 

26 

27 
28 
29 

30-47 
48-55 

56-63 

64-71 

72 

73-79 

80-87 

88 

89-95 

96-103 

104-1  1  1 

112-1  19 

120 

121 

122-166 

167-21 1 

212-231 

232-237 

238-270 

271-279 

280-1023 

1024-65533 

65534-65535 


Task 

Unus 
Task 
Task 
Repe 
Cur  r 

Cur  r 

Y-op 

ICW 

Prop 

Unus 

Inte 

Act  i 
Int  . 
CP  M 
Int  . 
Int  . 
Swi  t 
Unus 
Des  i 
Stor 

Segm 

Loca 
Real 

Di  sk 
Di  sk 
Card 
Unus 
Prin 
Unus 
Erro 
User 
Mai  1 


A-Reg. 
ed 
Index 
Base  S 
at  Inst 
ent  Ins 
be  i  ng  R 
ent  Ind 
Cont  rol 
e  rand  f 
Address 
ram  Add 
ed 

rrupt  B 
Regi  ste 
ve  Stat 
A-Reg 
o  n  i  tor 
Index 
Base 
ch  Valu 
ed 

gnat  or 
age  Pro 
Regi  ste 
ent  Ide 
Regi  ste 
t  i  on  Co 
Time  C 
Input 
Output 
Input 
ed 

ter  I/O 
ed 

r'  Rout  i 
Progra 
box 


(0-7) 

B-Reg.   (1-7) 
-Reg.   (0-7) 
rue  t  i  on  Temp • 
t  rue  t  i  on 
epeat ed 
i  rec  t 

Word  (ICW) 
or  Indi  rec  t  i  on 

i  n  Memo ry 
ress  Regi  st er 

reakpo  i  n t 

rs  (0-7) 

us  Words  (0-7) 

i  sters  (0-7) 

Clock 

B-Reg.   (1-7) 
S-Registers  (0-7) 
es  Temporary 

Storage  Words  (DSW) 

tection 

rs  (SPR) 

nt  i  f  i  cat  i  on 

rs  (SIR) 

unt  er 

1  ock 

Buffer 

8uf f er 
Buffer 

Buffer 

nes 

m  Area 


♦•Temporary  Location  Established  By  Programmers  Convention 

REGISTER  -  MEMORY  MAPPING 
Figure  V - 2 


68 


D.   TIMING 

Although  no  formal  timing  survey  was  conducted*  an 
analysis  of  the  Emulation  itself  provided  an  indicator  which 
was  used  in  developing  a  comparison  to  real-time.  For  this 
analysis  it  was  assumed  that  each  instruction  was  executed 
using  direct  addressing  and  not  in  repeat  mode.  The  IFETCH 
routine  used  16  microseconds  which  was  an  automatic  overhead 
acguired  by  all  instructions.  The  operand  fetch  and  store 
routines  (YFETCH,  YSTORE  and  Y2FETCH)  added  an  additional 
33*  30*  or  14  microseconds*  respectively.  Thus  any  in- 
struction which  referenced  a  Y-oDerand  incurred  an  addition- 
al overhead  of  14  microseconds  at  a  minimum.  Adding  to  this 
overhead*  the  execution  time  of  the  basic  oocode  itself 
yielded  the  time  estimated  for  typical  instructions  given  in 
Table  V-2. 


INSTRUCT  ION 
TIME 

OPERANDS 

EMULATION 
TIME 

AN/UYK-7 
TIME 

Load 
Add 
Add 
Di  v  i  de 

Reai  st  er  *  Y 
Regi  st  er  *  Y 
Regi  st er 
Regi  st er  *  Y 

60 
63 
36 
600 

1.5 

1.5 
1.0 
15 

TIME  ESTIMATES 


TABLE  V-2 


b9 


Using  these  figures  it  was  estimated  that  this  Emulation 
ran  on  the  order  of  40  times  real-time.  Two  steps  could  be 
taken  that  would  considerably  improve  this  time.  First* 
move  all  out -of - 1 i ne  subroutine  calls  in-line  in  the  opcode 
subroutines.  Second*  enhance  the  Interpreter  as  discussed 
under  Instruction  Timing  in  Chapter  III.  It  has  been  es- 
timated that  this  same  Emulation  could  run  at  approximately 
5  times  real-time  on  an  enhanced  D-Machine.  This  time  com- 
pares favorably  with  a  Simulation  of  the  AN/UYK-7  written  in 
PL-560  for  the  IBM  360,  which  runs  on  the  order  of  1000 
times  real-time.  As  discussed  in  Chaoter  II,  it  would  be 
difficult  to  approach  real-time  in  emulating  the  AN/UYK-7 
because  of  the  parallelism  of  its  fetch  and  field  isolation 
operations.  The  addition  of  a  Field  Select  Unit  (FSU)  and 
additional  internal  temporary  registers  would  be  reguired 
before  a  real-time  emulation  could  be  realized. 


70 


VI.   SUMMARY 


The  authors'  conclusions  and  recoir^endations  resulting 
from  any  research  project  are  a  fundamental  part  of  the  for- 
mal presentation  and  are  therefore  included  in  this  thesis. 
In  addition/  the  authors  felt  that  the  reader?  who  might  be 
contemplating  an  emulation  project*  would  be  interested  in 
the  problem  areas  encountered  during  the  pursuit  of  this 
thesis.  Accordingly  this  chapter  is  divided  into  two  sec- 
tions -  Problems  and  Conclusions. 

A.   PROBLEMS 

During  the  course  of  this  emulation  numerous  software 
and  hardware  problems  were  encountered  *  h  i  c  h  had  a  consider- 
able effect  on  progress  and  the  amount  accomplished  in  the 
allocated  time.  Software  problems  stemmed  principally  from 
poor  documentation  of  the  D-Machine,  the  AN/UYK-7,  their  as- 
sociated languages  and  internal  configuration.  The  software 
problems  with  the  D-Machine  were  generally  resolved  through 
experimentation  on  the  machine  or  through  phone  calls  to 
Burrough's  Advanced  Development  Organization  (ADO).  The 
lack  of  thorough  AN/UYK-7  documentation  proved  to  be  a  more 
severe  handicap  since  no  test  base  for  experimentation  was 
accessible  at  the  Naval  Postgraduate  School.  Such  a  medium 
is   absolutely   mandatory   when   working   in   the   emulation 


71 


environment.  The  programmer  must  be  able  to  determine  the 
machine  reaction  to  unorthodox  instruction  configurations. 
Some  degree  of  assistance  was  proviaed  by  the  Fleet  Combat 
Director  Systems  Support  Activity  (FCDSSA),  San  Diego;  how- 
ever/ in  some  cases  the  result  was  a  "best  guess"  as  to  what 
the  AN/UYK-7  response  would  be. 

Hardware  Droblems  are  to  be  expected  during  the  course 
of  any  major  project  and  particularly  when  a  new  machine  is 
involved.  This  Emulation  was  the  first  Droject  to  be  under- 
taken on  the  Naval  Postgraduate  School's  D-Machine  since  the 
machine  was  installed.  The  estimated  mean-t i me-bet ween- 
failures  (MTBF)  experienced  by  the  authors  was  less  than 
five  hours.  Problems  ranged  from  loose  circuit  boards  ana 
dirty  contacts/  to  aisk  read/write  heaa  misalignment.  Un- 
fortunately/ the  time  to  reoair  was  agcravated  by  the  fact 
that  the  school  has  no  technicians  trained  on  the  D-Machine/ 
and  the  authors  were  i nexoer i enced  in  its  maintenance  and 
operating  procedures.  without  the  assistance  provided  by 
Burrough's  ADO  the  project  could  not  have  been  seen  through 
to  fruition.  The  ADO  Drovided  the  school  with  engineering 
assistance  on  three  separate  occasions/  the  last  of  which 
uncovered  a  major  design  problem.  The  machine  has  since 
been  modified  and  the  system  is  presently  very  reliable. 


72 


In  addition  to  these  two  major   pro clem   areas   progress 
was  inhibited  by  the  following: 


1.  Lack  of  Software  Utilities  -  Since  the  D- 
Machine  was  a  new  installation  the  school 
has  not  had  the  opportunity  to  generate  the 
numerous  desirable  software  utilties.  In  an 
effort  to  eliminate  the  inherent  slowness  of 
a  "Card  Only"  system,  the  authors  have  un- 
dertaken the  implementation  of  the 
supervisor's  console  as  an  adjoint  to  this 
thesis.  The  authors  are  also  implementing  a 
Text  Editor  which  will  allow  for  on-line 
program  modification,  and  will  replace  the 
present  card  input  Line  Editor. 

2.  M i c roorogramm i ng  is  not  a  new  conceDt  at  the 
Naval  Postgraduate  School;  however,  actual 
experience  was  lackino.  The  Computer  Sci- 
ence Department  has  played  a  Tiajcr  role  in 
implementation  of  the  D-Machine  and  the  re- 
guired  expertise  is  rapidly  oeing  developed. 

3.  The  learning  curve  for  undertaking  an  emula- 
tion is  tremendous.  The  target  machine,  the 
host  machine,  their  respective  programming 
languages  and  internal  configurations  must 
be  learned  and  understood  in  minute  detail. 

4.  The  target  machine  for  this  Fmulation,  the 
AN/UYK-7,  is  an  extremely  soohisticated  and 
difficult  to  understand  comcuter.  The  cen- 
tral processor  instruction  set  is  fairly 
straightforward  and  easy  to  implement;  how- 
ever, the  numerous  and  differing  modes  of 
operation  severely  complicated  the  Emula- 
tion. 


B.   CONCLUSIONS 

The  authors  feel  that  they  have  successfully  achieved 
their  goal  of  demonstrating  the  feasibility  of  emulating  the 
AN/UYK-7  on  the  Burrough's  D-Machine.  The  design  oresented 
in  this  thesis  is  a  workable  design  as  evidenced  by  execu- 
tion of  AN/UYK-7  programs  successfully  and  by   execution   in 


73 


less  than  4  0  times  the  actual  execution  time  of  the  A  N  /  U  Y  K  - 
7.  Better  than  90%  of  the  AN/UYK-7  Instruction  Repertoire 
has  been  implemented  and  tested*  thus  providing  a  sound 
foundation  for  a  full  emulation.  The  design  allows  for  ex- 
pansion to  a  full  emulation  which  wouH  include  the  IOC  in- 
struction repertoire  and  Floating  Point  without  major  modif- 
ication. Further*  the  authors  have  concluded  that  by  modif- 
ication of  the  design  to  place  out-of-line  subroutine  calls 
in-line  and  enhancement  of  the  D-Machine*  the  Emulation 
would  execute  within  5  times  the  actual  speed  of  the 
AN/UYK-7. 

During  the  course  of  this  oroject  the  authors  had  an  op- 
portunity to  visit  the  Naval  Surface  Weapons  Center  (NSWC)*- 
D  a  h  1  g  r  e  n  *  Virginia.  Emulation  in  aeneral  was  discussed  with 
the  programming  staff*  who  had  just  completed  emulation  of 
the  Trident  Computer  on  the  Nanodata  Q  'v  -  1  *  and  who  were  con- 
temolating  emulating  the  AN/UYK-7  on  the  QM-2.  Based  on 
these  discussions*  the  experience  gainec  in  the  course  of 
this  thesis*  and  presupposing  the  oresent  level  of  knowledge 
of  the  authors?  it  is  estimated  that  a  complete  emulation  of 
the  AN/UYK-7*  its  IOC  and  all  Interrupt  functions  would  re- 
guire  an  additional  2  man  years  of  procramming  effort.  This 
estimate  includes  a  reasonably  sophisticated  degree  of  test- 
ing* and  assumes  full  accessibility  of  the  D-Machine  and  an 
AN/UYK-7  test  base. 


7a 


VII.   RECOMMENDATIONS 


The  authors  feel  that  this  thesis  has  provided  them 
with  a  learning  experience  previously  unparalleled  in  either 
of  their  lives*  since  it  has  entailed  detailed  ana  indepen- 
dent learning  of  emulation,  microprogramming  (TRANSLANG), 
the  Burrough's  D-Machine  and  the  AN/UYK-7.  In  addition,  the 
authors  became  part  time  technicians  in  an  effort  to  keep 
the  D-Machine  running.  It  is  felt  that  the  same  educational 
horizons  await  any  student  considering  a  similar  project; 
however,  in  an  effort  to  k  e  e  d  others  from  having  to  "rein- 
vent the  wheel",  the  authors  have  included  much  of  what  was 
learned  about  these  subjects  in  this  thesis.  Hopefully,  by 
building  on  these  experiences,  others  will  be  able  to  begin 
at  a  much  higher  level  and  consequent ly  accomplish  more. 
The  following  recommendations  are  submitted  for  considera- 
tion bv  anyone  inclined  to  undertake  a  fhesis  involving  emu- 
lation. 


1.  Do  no  try  to  emulate  a  machine  that  uses 
hardware  interrupts  on  an  Interpreter  that 
does  not  have  interrupts. 

2.  Pick  a  taraet  machine  that  is  well  defined 
and  documented.  Computers  are  designed  to 
perform  a  soecific  set  of  functions?  the 
results  of  unorthodox  use  are  not  always 
known,  but  must  be  considered  by  the  emula- 
tor. The  availaoility  of  a  target  machine 
for  testing  to  determine  such  results  is 
mandat  ory . 


75 


3.  Ensure  that  the  host  Interoreter  is  well 
documented  and  has  a  reasonable  set  of  sys- 
tem utilities?  such  as>  an  editor,  de- 
bugger, simulator,  file  manager,  operatinq 
system  and  compiler. 

4.  Ensure  the  host  Interpreter  will  receive 
hardware  support  if  problems  arise. 

5.  Ensure  publications  are  available  covering 
utilites,  hardware,  languages  and 
target/host  machine  capabilities  and  opera- 
tion. 

6.  Be  preoared  to  work  independently  and  have 
your  questions  answered  through  your  own 
experi ment  at  i  on . 


In  addition  to  these  recommedat i ons ,  the  authors  would 
like  to  propose  several  thesis  topics  applicable  to  the  D- 
Mach  i  ne . 


1.  Several  projects  could  be  undertaken 
direct  follow  on  to  this  thesis: 


as 


An  Ooeratina  System,  File  Manager, 
and  Assembler  could  be  written  in 
AN/UYK-7  machine  language  utilizing 
the  existing  Emulator. 

The  present  Emulation  could  be 
enhanced  to  include  Floating  Point 
and  any  un i mp 1 emen t ed  instructions, 
including  incorporation  of  the  IOC 
functions  and  allowing  for  synchro- 
nous I  /0  . 

A  timing  survey  could  be  conducted 
comparing  the  existing  Emulation  with 
AN/UYK-7  benchmarks. 


2. .  Several  thesis  projects  are  possible  which 
entail  enhancing  the  capabilities  of  the 
existing  O-Machine  Installation.  These  in- 
clude writing  the  interface  to  tne  PDP- 
11/45,  ana  a  resident  Text  Editor. 


76 


The  stand  alone  environment  of  the  D- Machine  lends  it- 
self to  experimentation  with  the  design  of  operating  systems 
and  file  managers. 

In  summary*  the  authors  would  like  to  state  that  they 
found  the  D-Machine  an  outstanding  learning  device  in  spite 
of  its  many  hardware  problems.  The  authors  found  the  abili- 
ty to  emulate  existina  computers  exciting,  and  found  the 
realization  that  they  could  build  a  working  model  of  any 
computer  they  could  desian,  exhilarating. 


77 


APPENDIX  A.  USER'S  MANUAL 


A.   D-MACHINE 

When  the  D-Machine  was  installed  at  the  Naval  Postgra- 
duate School*  it  was  not  accoitioan  i  ed  by  any  form  of  documen- 
tation for  its  operation*  preventive  maintenance*  diagnos- 
tics or  utility  programs.  For  the  most  part  this  informa- 
tion has  been  derived  through  exoerimentation  and  freauent 
calls  to  Burrough's  ADO.  Some  of  the  more  pertinent  infor- 
mation is  included  in  this  User's  Manual  to  enable  the  user 
to  load  and  run  a  proaram  such  as  the  AN/UYK-7  Emulation. 
Unless  specified  otherwise  all  addresses  given  in  this  dis- 
cussion are    in  hexadecimal. 

1.   System  Initializing 

The  machine  is  secured  every  night  ana   must   there- 
fore* be  reinitialized  when  powered  uo  each  morning. 

a.  Ensure  circuit  breakers  2*  7  and  10  are  on. 

b.  Push  the  "ON"  button  on  the  disc  and  all 
three  Interpreters. 

c.  With  desired  discs  in  the  drives*  push  the 
two  "RUN"  buttons  on  the  disk  unit. 

d.  Turn  on  the  card  reader  and  printer. 

e.  Place  the  IOP  in  normal  vice  single  step 
mode  via  the  switch  inside  the  cabinet  on 
the  right. 


78 


f.  Push  the  "LOAD"  button  on  the  IOP;  then 
push  "CLEAR". 

g.  Place  the  cards  marked  IOP-Loader  into  the 
card  reader.  Cards  should  be  read  and  the 
IOP  should  stoD  at  an  MPAD  of  OOFA.  If 
not t     repeat  steps  e  through  a. 

h.  Push  the  "LOAD"  button  on  IOP  to  return  the 
IOP  to  norma  1  . 

i  .  Perform  steos  e  to  h  for  each  of  the   other 

two   Interpreters   using  the  cards  marked 

STK-loader.   They  should  halt  at  a  MPAD   of 
004A. 

k.  Push  "CLEAR"  on  each  Intreoreter.  They 
should  bootstrap  themselves  through  the  IOP 
and  halt  at  either  0542  or  051A.  (An  In- 
terpreter must  be  at  0542  to  run  a  program 
and  only  one  Interpreter  can  be  at  0542  at 
a  time.)  Clear  the  IOP  to  force  an  Inter- 
preter to  switch  from  051A  to  0542. 


The  D-Machine  now  thinks  it  is  a  Burrough's  B6700 
single-stack  machine.  Any  utility  can  be  run  using  the 
proper  control  cards  as  documented  in  the  computer  lab.  The 
more  common  utilities  are  Sunrise  (updates  the  day*  date  and 
time?  should  be  run  first  thing  every  morning),  Dir-List 
(prints  out  the  directory;  system  or  user),  Compile  (com- 
piles ALGOL  programs)  and  TRANSLANG  (assembles  micropro- 
grams). By  use  of  the  orooer  control  cards,  the  user  can 
also  obtain  a  source  listing  of  his  program  as  it  is  being 
compiled  or  assembled.  Actually  the  default  is  a  printout 
every  time  and  the  user  must  insert  a  "  $  -  1  i  s  t  clist"  control 
card  to  eliminate  the  listing. 


79 


To  make  the  computer  act  as  some  machine  other  than 
the  B6700,  use  the  control  card  "7SMLQAD  filename".  The  "?" 
must  be  in  column  one  and  the  rest  of  the  card  is  free- 
format.  This  loads  the  microprogram  "filename"  (which  must 
be  an  assembled  T R A N SLANG  program)  into  micro-memory  over- 
laying the  stack  machine  and  then  transfers  control  to  that 
program  starting  at  address  0000.  Thus  to  load  the  AN/UYK- 
7,  execute  "?SML0AD  UYK7-L0ADER"  on  one  Interpreter  and 
"7SML0A0  ANUYK7-EMULAT0R"  on  the  other.  Refer  to  the  ao- 
propriate  sections  of  this  chapter  for  further  instructions 
on  the  execution  of  these  programs. 

2.   Diagnostics 

The  orograms  used  for  diagnoscing  hardware  problems 
are  written  in  TRANSLANG  and  maintained  as  object  modules  on 
cards.  The  approDriate  orogram  is  loaded  in  the  same 
fashion  as  the  bootstrap  loader  and  terminates  at  a  signifi- 
cant address.  When  "cleared"*  it  should  aaain  terminate  at 
an  address  which  indicates  success  or  failure.  The  operator 
must  determine  which  from  the  program  listing*  as  no  mes- 
sages are  printed.  There  are  no  diagnostics  written  for  the 
disk*  printer  or  card  reader.  At  the  present  time  a  CRT 
terminal  is  hooked  ud  to  the  1 0  P  *  however*  there  is  no 
software  supoort  for  it.  An  interface  is  being  written  into 
the  operating  system  and  eventually  all  commands  to  and  from 
the  operator  will  be  via  the  CRT.  The  card  reader  and  line 
printer  will  then  be  strictly  data  I/O  ports. 


80 


3.   Debugging 

While  executing  any  T R A N SLANG  program,  the  user  can 
monitor  the  program  by  use  of  the  nixie  light  display  panel 
and  the  function  switch  assigned  to  each  processor.  The 
lights  indicate  hex  numbers.  By  selecting  the  appropriate 
function  the  user  can  observe  the  current  nano i nst rue t i on 
being  executed?  the  address  of  the  current  microinstruction 
(MPAD);  the  memory  address  last  written  to  or  read  from 
(B^Atf);  and  the  MIR  register  (MIR  and  EXT).  The  MIR  func- 
tion displays  the  lower  16  oits  of  the  mir  register  while 
the  EXT  function  displays  the  upper  16  bits.  These  func- 
tions are  presently  the  only  means  of  debuggina.  For  exam- 
ple, if  the  user  were  unsure  of  the  information  being  read 
from  S-memory,  he  could  insert  two  additional  instructions 
in  the  code:  an  instruction  to  olace  the  data  into  the  MIR 
register  and  a  "WAIT"  instruction.  The  CPU  halts  at  the 
"WAIT"  instruction  and  the  user  can  then  examine  the  infor- 
mation in  MIR  to  ascertain  its  validity.  The  user  may 
check  the  MPAD  to  determine  if  the  address  read  was  actually 
the  address  intended.  To  continue  the  program  the  user  must 
press  the  force-step  button  inside  the  side  panel.  If  the 
user  wished  to  step  through  a  series  of  instructions  follow- 
ing the  "WAIT",  he  could  go  to  single-steo,  and  while  hold- 
ing the  force-step  button,  press  the  single-step  button  to 
override  the  "WAIT".  After  passing  the  "WAIT",  single-step 
to  execute  one  instruction  at  a  time.  In  this  manner  the 
user  can  debug  several  instructions  one  at  a  time. 


81 


B.   AN/UYK-7 

This  section  of  the  User's  Manual  discusses  how  the  user 
can  reconfigure  the  D-Machine  into  an  AN/UYK-7. 


First,  ensure  that  the  disk  packs  which  are  mounted 
are  the  AN/UYK-7  System  Packs  and  that  both  in- 
terpreters are  loaded  with  an  ALGOL  Stack 
Mach  i  ne . 

Second,  insert  an  "7SML0AD  UYK7-L0ADER"  card  in  the 
card  reader.  This  will  cause  the  Loader's  mi- 
crocode to  overlay  the  stack  machine's  micro- 
code and  stop  at  address  "0000". 

Third,  insert  an  "7SML0AD  UYK 7-EMULATOR"  card  in 
the  reader.  This  will  cause  the  Emulator's  mi- 
crocode to  overlay  the  alternate  stack  machine 
and  stop  at  address  "00A0".  The  AN/UYK-7  is 
now  ready  to  accept  and  execute  programs. 

Fourth,  place  the  AN/UYK-7  source  programs  in  the 
reader  and  force  step  the  Loader  and  the  Emula- 
tor, respectively.  The  Loader  will  read  one 
card  at  a  time,  decode  it  and  place  the  32-bit 
resulting  instruction  in  memory  for  subseauent 
execution  by  the  Emulator. 


The  last  instruction  of  all  user  programs  shoula  be  a 
"HALT",  which  will  cause  the  Emulator  to  halt  ana  the  Loader 
to  be  reinitialized  for  the  next  job.  Force  stepping  the 
Emulator  after  the  halt  will  cause  the  next  job  to  be  read 
and  executed.  Use  of  this  convention  permits  batch  process- 
ing of  programs  by  the  AN/UYK-7.  The  orogram  deck  organiza- 
tion is  discussed  in  the  next  section.  Individual  programs 
are    separated  by  "N"  cards. 


82 


1  .   Loader 

a .   Macros 

This  section  describes  how  a  program  must  be 
keypunched  for  input  to  the  Loader.  All  Macro  control  char- 
acters and  formats  are  listed  in  Figure  A-l.  Any  character 
typed  in  column  one»  which  is  not  listed,  will  cause  an 
"Illegal  Instruction"  message  and  the  card  will  be  ignored. 
It  is  noteworthy  that  all  functions  are  optional  with  the 
exceotion  of  the  "N",  which  must  terminate  the  program  deck. 
All  addresses  are  in  octal  and  considered  absolute  as  far  as 
the  user  is  concerned;  however,  they  are  offset  by  1024  by 
the  Loader.  Macros  and  instructions  may  be  interspersed  as 
des i  red . 


83 


COL.   COL. 
1     4-8 


FUNCTION 


A"  Reaister  0-7 


Cols.  9-19  contain  tne  octal  value 
to  be  inserted  in  the  listed  A-Reg 


I"  Register  1-7 


Cols.  9-19  contain  the  octal  value 
to  be  inserted  in  the  listed  B-Reg. 


"D"  Octal  Address 


Cols.  9-16  contain  the  decimal  value 
to  be  inserted  at  the  address  listed 
or  in-line  if  the  address=0000 . 


"R"  Octal  Address 


Cols.  9-19  contain  the  decimal  number 
of  words  to  be  saved  at  the  address 
listed  or  in-line  if  the  address=0000 . 


"W"  Octal  Address 


Cols.  9-80  contain  the  character  string 
to  be  inserted  at  the  address  specified. 
The  string  terminates  before  col.  80  if 
a  single  quote  (')  is  encountered. 


"S"  Switch  Value 


Cols.  6-8  contain  an  octal  number 
whose  bit  Dattern  selects  which  of 
eight  AN/UYK-7  switches  the  user 
desires  set  . 


ML"  Octal  Address 


Causes  Base  S-Registers  to  be  set 
at  8K  cages  starting  at  1024,  and 
the  program  to  be  loaded  at  Address. 


"0"  Octal  Address 


Causes  change  in  the  program  counter  in 
order  that  subseguent  instructions  may 
be  loaded  at  Address. 


MN"  Octal  Address 


Terminates  loading  of  program  and 
initializes  PAR  to  Address  for 
the  Emu  1  at  or . 


LOADER  MACRO  DEFINITIONS 


FIGURE  A-l 


8a 


b.   Instruction  Preparation 

-  For  inputting  instructions  to  the  Loader  three 
basic  formats  are  used  which  correspond  roughly  to  the  five 
formats  used  by  the  AN/UYK-7.  The  Loader  formats  are 
presented  in  Figure  A - 2  under  their  respective  AN/UYK-7  For- 
mat Headings.  All  fields  require  a  right  justified  octal 
representation.  The  " i "  field  should  always  be  either  a  one 
or  a  zero  since  it  represents  a  single  bit.  The  combined 
"  F  3  ,  K  •'  field  of  Format  III  instructions  reguires  that  K  al- 
ways be  zero?  therefore?  valia  inputs  are  (0,2,4,6)  which 
correspond  to  an  F3  of  (0,1,2,3).  Columns  1-3  must  always 
be  left  blank.  Columns  15-80  may  be  used  for  programmer's 
comments.  Each  instruction  is  decoded  into  one  32-bit  word 
and  assigned  to  the  next  sequent  ial  address  in  memory.  How- 
ever, if  the  instruction  is  a  half-word  instruction  then  it 
will  be  stored  in  the  lower  half  of  the  previous  word  if 
that  word  also  contained  a  half-word  instruction,  else  it 
will  be  stored  in  the  upper  half  of  the  next  sequential  ad- 
dress. An  instruction's  sequential  address  assignment  can 
only  be  changed  via  the  "0"  or  "L"  macros,  which  must  pre- 
cede the  instruction.  A  sample  program  is  presented  in  Ap- 
pendi  x  D . 


85 


FORMAT  I 


COL 
1-3 

BLANK 


COL 

a-5 

OPCODE 


COL 
6 

A-REG 


COL 
7 

K 


COL 
8 
B 


COL 
9 

I 


COL 
10-14 

Y-OPERAND 


FORMAT  II 


COL 
1-3 

BLANK 


COL 

a-5 

OPCODE 


COL 

6 

A-REG 


COL 

7 
F2 


COL 
8 
B 


COL 
9 

I 


COL 

l  o-i  a 

Y-OPERAND 


FORMAT  III 

COL  COL  COL  COL  COL  COL  COL 

1-3  a-5  6       7       8       9  io-ia 

BLANK  OPCODE  A-REG  F3,K      B        I  Y-OPERAND 


FORMAT  IV-A 


COL 

COL 

COL 

COL 

COL 

COL 

1-3 

a-5 

6 

7 

8 

9 

BLANK 

OPCODE 

A-REG 

Fa 

B 

i 

FORMAT  IV-B 


COL      COL      COL 
1-3      a-5       6 

BLANK   OPCODE    A-REG 


COL 
7-9 
SHIFT  DESIGNATOR 


INSTRUCTION  FORMATTING 


FIGURE  A-2 


86 


C.   TRANSLANG 

Several  modifications  have  been  made  to  the  D  - 
Machine  and  the  microprogramming  1  a  n  g  u  a  a  e  ,  TRANSLANG,  since 
the  publication  of  reference  9  in  1970.  Unfortunately,  an 
addendum  to  reference  9  has  not  been  published  and  these 
powerful  modifications  remain  undocumented.  Because  the  au- 
thors took  advantage  of  these  capabilities  in  writing  this 
Emulation  the  changes  are  documented  here  to  provide  'the 
user  a  ready  reference.  They  include:  additional  logical 
operators,  program  address  modifiers,  and  an  additional  Y- 
select  input  register  ( B  M A  R ) . 

(1)  Logic  Ooerators.  The  additional  logic 
operators  are  listed  in  Table  A-l  along  with  the  code  gen- 
erated by  the  Mi c rot rans 1  at  or  when  they  are  encounterea.  In 
the  Table,  Al  and  B  are  assumea  as  the  X/Y  input  operands 
respectively.  In  addition,  listed  under  the  columns  la- 
belled TRUE/FALSE,  are  the  tests  generated  by  the  Micro- 
translator  when  a  TRUE/FALSE  conditional  test  is  encountered 
subseguent  to  the  logical  operation. 


87 


OP     MEANING 


LSS  Less  Than 

LEQ  Less  Than  or  Equal 

EGL  Equal 

NEQ  Not  Equal 

GEO  Greater  Than  or 

Equal  To 

GTR  Greater  Than 


CODE 

TRUE 

FALSE 

GENERATED 

TEST 

TEST 

Al-B 

NOT  AOV 

AOV 

1   Al-B-1 

NOT  AOV 

AOV 

Al  EQV 

B 

ABT 

NOT  ABT 

Al  EQV 

B 

NOT  ABT 

ABT 

Al-B 

AOV 

NOT  AOV 

Al-B-1 

AOV 

NOT  AOV 

LOGICAL  OPERATORS 
TABLE  A-l 

The  programmer  is  cautioned  that  when  the 
Mi c rot rans 1  a t or  encounters  the  keywords  TRUE/FALSE  it  back- 
tracks to  the  last  logical  operator  to  determine  which  test 
to  generate.  Thus  a  TRUE/FALSE  conditional  test  which  is 
arrived  at  through  branching  may  not  have  generated  the  ex- 
act code  the  programmer  anticipated.  These  operators  were 
intended  to  be  used  in  a  seguential  fashion  as  follows: 


Al  GTR  B 

If  TRUE  Then  (operation) 


The  M i c rot  pans  1  a t or  generates: 


Al-B-1 

If  AOV  Then  (operation) 


The  following  illustrates  circumstances  in 
which  the  M i c rot rans 1  a t o r  does  not  generate  the  code  expect- 
ed by  the  programmer: 


Al  LSS  B 

If  LCI  Then  Al  GTR  B;Step  Else  Skip 

If  TRUE  Then  (operation) 


88 


Generates  the  code: 

Al-B 

If  LCI  Then  Al-B-i;Steo  Else  Skip 

If  AOV  Then  (operation) 

In  this  situation  "If  AOV"  is  always  gen- 
erated when  the  TRUE  is  encountered?  although,  obviously  if 
LCI  was  not  set  then  the  programmer  desired  to  test  for 
"Less  Than". 

( 2 )  Program  Address  Modifiers.  Two  Dowerful  new 
instructions  were  adoed  to  the  D-Machine  which  allow  direct 
transfer  of  orogram  control.  These  are  the  two  Type  II  in- 
structions: "Label -1=MPCR"  and  "Labe 1  -  1 =CPCR" .  The  first 
causes  a  direct  change  in  the  program  sequence  by  loading 
MPCR  with  the  new  Label.  The  second  can  be  classified  as  a 
return  jump  since  it  causes  a  transfer  of  AMPCR  to  MPCR/  and 
MPCR+1  to  AMPCR;  thereby  setting  ud  a  orogram  jump  to  a 
subroutine*  and  saving  the  return  address.  This  coae  is 
i  dent  i  ca 1  to: 


Label-1=AMPCR 
CALL 


The  only  difference  between  them  is  that  the  CPCR  requires 
only  one  instruction  for  execution,  while  the  CALL  requires 
two  i  ns t  rue  t  i  ons  . 

(3)  BMAR.  The  BMAR  register  is  formed  by  the 
concatenation  of  BR1  or  BR2  (16  bits)  ana  MAR  (8  bits).  It 
can  be  used  as  a  Y-Input  of  24  bits  to  the  Adder.  The  actu- 
al  BR  register  selected  is  the  one  most  recently  referenced 


89 


in  an  external  operation.  The  user  is  cautioned  in  the  use 
of  BMAR  because  of  its  odd  size  of  24  bits.  The  unwary  pro- 
grammer could  unintentionally  allow  extraneous  bits  in  the 
most  significant  byte  when  BMAR  is  used  for  temporary 
storage  of  16-bit  addresses.  That  is*  the  assignment 
MA1=MAR"  is  considered  to  effect  a  transfer  of  16  bits, 
while  in  fact  24  bits  are  transferred.  A  subsequent  state- 
ment of  "BMAR=A1"  could  permit  extraneous  bits  to  be  intro- 
duced in  the  third  least  significant  byte,  if  the  programmer 
had  made  the  assumption  that  only  16  bits  were  involved  and 
automatic  masking  had  taken  place.  The  programmer  can  force 
selection  of  BR1  or  BR2  bv  issuing  an  ASR  or  ASE,  respec- 
tively, prior  to  a  BMAR  reference.  These  are  considered 
external  function  NOOPS  in  the  Naval  Postgraduate  School 
Configuration;  however,  they  may  not  appear  concurrently 
with  a  BEX  statement. 

The  remainder  of  the  TRANSLANG  statements 
are  reasonably  straightforward  once  the  programmer  under- 
stands the  instruction  timing  idiosyncracies.  Reference  9 
provides  excellent  guidance  for  the  novice  m i c roproqrammer . 


90 


APPENDIX  B.  EMULATOR  PROGRAM  LISTING 


This  aopendix  provides  a  copy  of  the  Mi c rot rans 1  a t or 
output  listing  of  the  Emulator.  A  copy  of  the  source  program 
is  maintained  on  cards  and  also  on  the  Burrough's  D-Machine 
disk.  The  object  module  produced  by  the  M i c rot rans 1  at  or  is 
maintained  on  disk.  Each  line  of  the  program  is  divided 
into  four  sections.  The  leftmost  grouping  consists  of  the 
hexadecimal  address  to  which  the  microinstruction  was  as- 
signed by  the  Microtranslator  during  assembly.  This  is  fol- 
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138 


APPENDIX  C.   LOADER  PROGRAM  LISTING 


This  appendix  provides  a  cooy  of  the  Mi c rot  pans  1  at  or 
output  listing  of  the  Loader  written  in  conjunction  with  the 
Emulator.  Its  source  is  maintained  on  disk  and  cards;  and 
its  object  module  is  maintained  on  disk.  The  Loader  actual- 
ly consists  of  three  separate  programs  which  provide  assem- 
bly/ debugging  and  IOC  functions  to  the  Emulator.  It  is  a 
by-product  of  the  Emulation,  and  it  was  used  for  implementa- 
tion and  testing  of  the  Emulator.  Its  functions  should  be 
incorporated  in  the  Emulator  Program  in  the  course  of  expan- 
sion to  a  full  emulation. 


139 


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153 


APPENDIX  D.   SAMPLE  AN/UYK-7  SORT  PROGRAM 


This  appendix  provides  a  copy  of  a  sample  program  which 
was  used  to  demonstrate  the  capability  of  the  D- Machine  to 
function  as  an  AN/UYK-7.  The  program,  written  in  AN/UYK-7 
Machine  Language*  will  read  twelve  numbers  per  card,  print 
the  numbers,  sort  the  input  and  orint  the  sorted  results. 
Any  number  of  cards  could  be  read  and  sorted  until  the  "END" 
card  is  encountered.  At  this  point  the  program  would  reini- 
tialize memory  and  be  ready  to  accept  the  next  program. 
Several  of  the  Loader's  macro  functions,  including  the  L,  W , 
D  and  N  options,  were  utilized  along  with  the  appropriate 
formats  for  the  five  instruction  types.  It  must  be  em- 
phasized that  when  this  program  was  run  the  ALGOL  Machine 
had  been  removed  and  the  D-Machine  reconfigured  through  mi- 
croprogramming to  be  an  AN/UYK-7.  The  entire  output  format 
and  program  execution  were  produced  by  the  Loader/Emulator 
combination  with  the  IOP  being  used  strictly  as  an 
Input/Output  Channel.  Examples  of  the  Loader  and  Debugaer 
output  optional  listings  for  this  sample  program  are 
presented  in  Appendix  E  and  F. 


15a 


ORIGIN 
10 


SORT  ROUTINE  AT  LOCATION  0002 


JUMP  TO  TITLE  ENDING  ROUTINE 
BEGIN  TITLE  PRINTING  ROUTINE  AT 


L   00002 
D   01001 

203320001001 

1 10310001002 

440310001002 

532220000014 

523220000003 

102320001000 

512420000021 

320020001000 

201320000777 

514020000002 

101310001002 

241310001001 

240310001002 

330020001000 

514020000006 

201320001000 

530000004040 
0   04000 

071400005000 

071400005352 

071400005352 

070400001022 

071400005044 

071400005352 

0  7  1400005110 

071400005352 

071400005154 

070410001002 

106320001002 

446320005416 

531220004060 

071400005352 

071400005220 

071400005352 

071400005352 

071410001002 

510000000002     JUMP 
0   04040    RETURN  HERE 

071400005352 

071400005352 

071400005264 

071400005352 

071400005330 

071400005352 

071400005352 

071420001002 

071400005352 

071400005352 

51000000401  1 
0   04060    START  COMPLETION  ROUTINES  HERE 

071400005352 

071400001002      PRINT  END 

7706000  TERMINATE 


04000 


JUMP  TO  COMPLETION  ROUTINE  IF  END  CARD 


TO  BEGINNING  OF  SORT  ROUTINE 

FROM  SORT  ROUTINE  AND  FINISH  TITLES 


PROGRAM  AND  RESTART  EMULATOR 


155 


Iff  05000 

M  05022 

W  050U4 

W  05066 

W  051  10 

W  05132 

w  0515a 

W  0  517  6 

W  05220 

W  052a2 

W  0526^ 

W  05306 

W  05330 

W  05352 

W  0537a 

W  05ai6END 

N  oaooo 


123  a56  789  987  65a  321  023  a56  875  888  555  213 

357  652  389  123  583  7a2  928  65a  987  2a8  965  281 

321  to5a  987  123  a56  789  369  258  147  963  852  7ai 

END      TERMINATE  SORT  ROUTINE/  READY  FOR  NEXT  PROGRAM 


AN/UYK-7   EMULATION   DEMONSTRATION   PROGRAM 
THIS  IS  A  TEST  OF  THE  AN/UYK-7   EMULATION 
USING  A  MAChlNE  LANGUAGE  PROGRAM 
FOR  A  DEMONSTRATION  SORT  ROUTINE  USING 
THE  FOLLOWING  INPUT  NUMBERS: 
THE  RESULTS  OF  THIS  SORT 
ARE  AS  FOLLOWS: 


156 


APPENDIX  E.   SAMPLE  LOADER  OUTPUT  LISTING 


This  aopendix  provides  a  copy  of  the  output  received 
from  the  Loader  when  the  sample  program  discussed  in  Appen- 
dix D  is  run.  This  output  is  obtained  by  turning  on  the  IRQ 
switch  on  the  Loader's  Interpreter.  The  output  serves  as  a 
hard  copy  program  listing  for  the  programmer  and  can  be 
utilized  for  debugging.  The  address  to  the  left  of  each  in- 
struction is  the  octal  assignment  for  that  instruction, 
derived  from  the  last  "0"  or  "L"  card/  and  was  offset  by 
1024.  The  Loader  inout  is  terminated  by  an  " N"  card  which 
initializes  the  PAR  and  signals  the  Emulator  to  commence  ex- 
ecution. 


157 


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APPENDIX  F.   SAMPLE  DEBUGGER  OUTPUT  LISTING 


This  appendix  provides  a  sample  of  the  output  received 
from  the  Loader  when  it  was  used  as  a  debugger  for  the  sam- 
ple program  discussed  in  Appendix  D.  This  output  is  ob- 
tained by  turning  on  the  IRQ  switch  on  the  Emulator's  Inter- 
preter. The  switch  was  not  left  set  for  the  entire 
program's  execution  because  the  output  requires  approximate- 
ly thirty  pages.  The  IRQ  switch  causes  all  C M R  registers 
from  address  0000  to  0035  to  be  printed  as  each  instruction 
is  executed.  Each  time  and  instruction  does  a  Y-Operand 
write  that  address  is  also  dumped.  The  addresses  are  print- 
ed in  the  leftmost  column  and  include  the  following  informa- 
tion which  can  be  used  during  program  debugging: 


OCTAL 
ADDRESS 

0-7 

10 

11-17 

20-27 

30 

31 

32 

33 

3a 
35 


DESCRIPTION 


Task  A-Register  contents 

Unused  (always  =  0) 

Task  Index  B-Register  contents 

Task  Base  S-Pegister  contents 

Repeat  Instruction  (if  applicable) 

Current  Instruction  being 

Repeated  (if  applicable) 
Current  Indirect  Control 

Word  (if  applicable) 
Y-Operand  for  Indirection 

( i  f  appl i  cabl e ) 
ICW  address  in  memory  (if  applicable) 
Program  Address  Register 


Those  addresses  marked  "if  applicable"   would   normally 
be  zero/  but  could  contain  data  if  either  the  Repeat  mode  or 


161 


Indirection  mode  had  been  used  previously  in  the  program. 
The  lower  20  bits  of  aodress  0035  (PAR)  point  to  the  octal 
address  of  the  next  instruction.  The  upper  \2  bits  of  the 
PAR  are  those  ASR  bits  which  were  implemented  as  discussed 
in  Section  C  of  Chapter  V.  It  is  noteworthy  that  the  output 
is  an  eleven  bit  octal  representation  of  a  32-bit  binary 
word*  thus  the  leftmost  octal  digit  represents  only  two 
bits. 

by  utilizing  this  optional  listing  in  combination  with 
the  Loader  listing,  .  the  programmer  should  be  capable  of 
proceeding  through  his  program  step  by  step.  This  facility 
proved  an  invaluable  aid  in  troubleshooting  the  Emulator  as 
each  new  instruction  was  written  and  tested. 


162 


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16b 


GLOSSARY 


Active  Status  Register  (ASR):  A  special  word  in  the  AN/UYK-7 

used   to  indicate   the  status  of  special  conditions  or 

mooes  of  operation.    Each   bit   of   the   word   has   a 

separate  meaning  to  the  central  processor. 


ADO:  The  Burrough's  Advanced  Design  Organization,  Paoli, 
Pennsylvania,  which  designed  the  Naval  Postgraduate 
School's  D-Machine. 


A  Registers  (Al,  A2,  A3):  Each  of  the  three  A  registers  is 
functionally  identical.  The  A  registers  are  used  for 
temporary  data  storage  within  the  Logic  Unit  of  the  In- 
terpreter and  serve  as  a  primary  input  to  the  adder. 


Adder:  The  adder  in  the  Logic  Unit  of  the  Interpreter,  is  a 
modified  version  of  a  straightforward  carry  lookahead 
adder.   It  is  also  used  for  executing  logic  operations. 


Alternate  Microprogram  Count  Register  (AMPCR):  The  AMPCR  is 
a  12-bit  register  in  the  Memory  Control  Unit  of.  the  In- 
terpreter, which  contains  the  jump  or  return  address 
for  program  jumps  and  subroutine  returns  within  a  mi- 
c  roorogram . 


AMPCR:  Alternate  Microprogram  Count  Reaister. 


Arithmetic  (A)  Registers:  There  are  two  sets  of  eight  Arith- 
metic Registers  in  the  AN/UYK-7.  They  are  used  exten- 
sively in  arithmetic  calculations  and  are  directly  ad- 
dressable by  the  programmer. 


ASR:  The  Active  Status  Word  in  the  AN/UYK-7. 


8  Register:  The  B  register  is  the  primary  interface  between 
the  Logic  Unit  of  the  Interpreter  and  the  Data/Program 
Memory  or  Devices  through  the  Switch  Interlock.  It 
also  serves  as  a  secondary  inDut  to  the  adder. 


167 


Barrel  Switch:  The  barrel  switch  is  a  matrix  of  gates  in  the 
Logic  Unit  of  the  Interpreter,  used  to  shift  a  parallel 
data  word  any  number  of  places  to  the  left  or  right  in 
a  si  ngl e  c 1 ock  t  i  me. 


Base  Registers  1  and  2    (BR1,  BR2):  The   Base   Registers  are 

two   8-bit   registers  in  the  Memory  Control  Unit  of  the 

Interpreter/  which  usually  contain  the  base  address  of 
a  256-word  block  of  Data/Program  Memory. 


Base  (S)  Registers:  There  are  two  sets  of  eight  Base  Regis- 
ters in  the  AN/UYK-7  used  extensively  in  multi- 
programming and  mul t i -process i ng.  Base  registers  are 
used  for  operand  address  calculations. 


8R1  and  BR2:  Base  Registers  1  and  2  in  the  Interpreter. 


Building  Block:  The  term  used  to  describe  the  primary  tunc 
tional  units  of  the  Interpreter  Based  System  and  in' 
eludes:  Interpreter,  Data/Program  Memory  and  Switch  In' 
t er 1 oc  k  . 


Control  Memory  Registers  (CMR):  A  block  of  89   registers   in 
the  AN/UYK-7  usea  for  SDecial  fast  memory  operations. 


Condition  Register  (COND):  The  COND  is  a  12-bit  register  in 
the  Control  Unit  of  the  Interpreter  and  is  used  to 
store  various  condition  bits  for  use  during  program  ex- 
ecution. 


Central  Processing  Unit  (CPU):  The   primary   arithmetic   and 
control  unit  in  a  conventional  computer  system. 


Condition  Select:  The  condition  select  is  a  matrix  of  gates 
in  the  Control  Unit  of  the  Interpreter  that  computes 
the  results  of  a  computation  or  logic  operation  in  the 
Logic  Unit  with  a  preselected  result.  The  results  of 
the  comoarison  may  be  used  to  determine  the  sequence  of 
execution  of  microprogram  instructions. 


Control  Unit  (CU):  The  CU,  one  of  the  five  functional  units 
of  the  Interpreter,  is  used  for  condition  testing  and 
the  storage  and  aistribution  of  enable  signals  received 
from  the  nano i ns t rue t i ons  . 


168 


Counter  (CTR):  The  CTR  is  an  8-bit  counter  in  the  Z  register 
section  of  the  Memory  Control  Unit  of  the  Interpreter, 
used  for  loop  control  and  other  counting  functions. 


CTR:  Counter  in  the  Interoreter. 


Data/Program  Memory:  The  Data/Program  Memory  of  the  Inter- 
preter, also  called  S-Memory,  provides  storage  for  data 
and  program,  and  functions  similarly  to  the  main  memory 
modules  of  a  conventional  computer  system. 


Emulation:  Describes  a  process  through   which   the  hardware 

components   of   one  machine  (Host)  are    made  to  "appear" 

to  assume  the  specific  characteristics  of  the  hardware 
of  another  machine  (target). 


End-Around-Sh i f t :  A  shift  operation  in  either  the  left  or 
right  direction,  in  which  the  bit  or  bits  which  would 
be  shifted  out  of  the  register  are  reinserted  in  the 
more  significant  end. 


End-Of f -Sh i f t :  A  shift  ODeration  in  either  the  left  or  right 
direction,  in  which  the  bit  or  bits  shifted  out  of  the 
register  are  lost.  Vacated  bit  dosi t ions  are  automati- 
cally replaced  by  zeros. 


Firmware:  In  the  Interoreter  Based  System,  firmware  is  the 
combination  of  stored  logic  in  the  micro-memory  and  the 
hardware  logic  of  the  Interpreter. 


GC  Bits:  A  set  of  two  (GC1,  GC2)  global  condition  bits  in 
the  Interpreter.  They  are  used  as  lockouts  during  com- 
munications to  the  I/O  processor. 


HALFFETCH:  A  subroutine  written  for  the  Emulator,   which   is 
executed  when  a  halfword  instruction  has  been  decoded. 


Horizontal:  A  tyoe  of  microprogramming  instuction  which  con- 
trols multiple  gates  simultaneously  allowing  parallel 
functions  to  execute. 


Host:  A  term  used  in  Emulation  to  define  the  machine  on 
which  another  machine  is  to  be  emulated  (imitated).  In 
this  thesis  the  Burrough's  D-Machine. 


169 


ICw:  Indirect  Control  Word  in  the  AN/UYK-7. 


IFE1CH:  A  subroutine  written  for  the  Emulator,  which  reads 
the  next  instruction  from  main  memory,  deciphers  the 
Op-code  and  passes  control  to  the  appropriate  Op-code 
execution  subroutine. 


Incrementer  (INCR):  The  INCR  is  in  the  Memory  Control  Unit 
of  the  Interpreter  and  increments  the  address  of  the 
next  microinstruction  to  be  executed  by  the  Interpreter 
by  zero,  one  or  two,  depending  on  the  successor  in- 
struction which  is  either  implied  or  specified.  A  WAIT 
causes  an  increment  by  zero,  a  STEP  causes  an  increment 
by  one,  and  a   RETN  causes  an  increment  by  two. 


Indirection:  An  addressing  technigue  or  mode  of  operation  of 
the  AN/UYK-7  in  which  Y-Ooerand  address  calculation 
points  to  an  Indirect  Control  Word  (ICW)  which  in  turn 
points  to  the  ooerand  or  another  ICW.  Indirection  is 
determined  by  the  i-field  of  an  instruction. 


Indirect  Control  rtord  (ICW):  The  ICW  is  a  32-bit  word  in  the 
AN/UYK-7  used  in  Indirection  which  can  be  broken  down 
into  several  fields.  The  fields  determine  the  mode  of 
indirect  address  calculation  to  be  used  in  pointing  to 
the  next  ICW  or  the  Y-ODerand. 


Indexing:  An  addressing  technique  wherein  the  normal  address 
calculated  is  incremented/decremented  (indexed)  by  the 
value  in  the  specified  index  register. 


Index  (B)  Register:  There  are  two  sets  of  seven  Index  Regis- 
ters in  the  AN/UYK-7.  They  provide  the  ability  to  per- 
form Indexing  during  memory  referencing,  and  may  also 
be  used  as  counters. 


INT:  An  Interrupt  signal  issued  by  an  Interpreter. 


Interpreter:  The  Interpreter  is  the  basic  building  block  of 
the  Interpreter-Based  System.  Functionally,  it  is 
characterized  by  the  combination  of  microprogram  in- 
structions stored  in  its  M  memory  and  the  combination 
of  bits  in  its  nano i nst rue t i on  which  enable  signals  to 
implement  the  hardware  logic. 


170 


Interpret  er-9aseci  System:  A  computer  design  concept  that 
provides,  in  the  form  of  basic  building  blocks,  the 
throughput  and  flexibility  for  a  variety  of  data  pro- 
cessing requirements. 


Interrupt:  In  the  AN/UYK-7,  the  Interrupt  signals  the  cen- 
tral processor  to  cease  its  normal  instruction  flow  and 
respond  to  a  request  for  services.  In  the  D- Machine, 
Interrupt  (INT)  is  a  flag  which  may  oe  set  between  pro- 
cessors siqnallinq  that  a  message  has  been  placed  in 
the  Mailbox. 


Least  Significant  Bit  (LS8):  For  a  number  or  value 
represented  in  binary  notation,  that  bit  position  which 
represents  the  least  significant  portion  of  the  number. 


LIT:  Literal  Register  in  the  Interpreter. 


Literal  Reaister  (LIT):  An  8-bit  register  in  the   Z  section 

of  the  Memory  Control  Unit  of  the  Interpreter,  which  is 

used  for  temporary  storage  of   literals   from  microin- 
st  rue  t  i  ons  . 


Logic  Unit  (LU):  The  LU  is  one  of  the  five  major   functional 

units   of   the   Interpreter.  It  performs  all  of  the  ar- 

tihmetic,  Boolean  logic,  and  shifting  operations  of  the 
Interpreter. 

Mailbox:  An  address  (64K)  in  the  In t eroret er ' s  S-Memory 
which  is  used  for  passing  messages  between  Interpreters 
and  the  IOP. 


MAR:  Memory  Address  Register  in  the  Interpreter. 


Memory  Address  Register  (MAR):  The  MAR  is  an  8-bit  register 
in  the  Memory  Control  Unit  of  the  Interpreter,  which 
contains  the  least  significant  8  bits  of  a  memory  or 
device  address. 


Memory  Control  Unit  (MCU):  The  MCU  is  one  of  the  five  major 
functional  units  of  the  Interpreter.  It  controls  the 
sequence  of  execution  for  microinstructions;  the  ad- 
dressing  of   Data/Program  Memory;  and  the  selection  of 


aev  ices. 


171 


Memory  Information  Register  (MIR):  Th^  MIR  is  a  register  in 
the  Loaic  Unit  of  the  Interpreter  which  serves  as  the 
output  interface  register  between  the  Interpreter  and 
the  Switch  Interlock. 


Microprogram  Address  Control  Register  (MPAD  CNTL):  The  MPAD 
CNTL,  a  register  in  the  Memory  Control  Unit  of  the  In- 
terpreter -  controls  the  loading  of  the  MPCR  and  the 
AMPCR,  and  determines  the  value  of  the  increment. 


Microprogram  Count  Register  (MPCR):  The  MPCR,  located  in  the 
Memory  Control  Unit  of  the  Interpreter,  is  a  12-bit  re- 
gister that  usually  contains  the  address,  in  M-memory, 
of  the  microinstruction  presently  being  executed  by  the 
Interpreter. 


Microproaram  Memory  ( M -Memory):  The  M -Memory  is  one  of  the 
five  major  functional  units  of  the  Interpreter.  It 
stores  microinstructions  which  characterize  the  Inter- 
preter for  a  given  apDlication,  and  may  be  implemented 
as  a  read/ write  semiconductor  memory. 


Microprogramming:  A  technique  for  implementing  the  control 
functions  of  a  digital  computer  using  programmable  con- 
trol signals  in  a  separate  memory  called  a  control 
store,  which  is  organized  on  a  word  basis. 


MIR:  Memory  Information  Reaister  in  the  Interpreter. 


Monoorogramming:  A  general  computer  operating  environment  in 
which  one  program  at  a  time  is  executed. 


Most  Significant  Bit  (MSB):  For  a  number  or  value  represent- 
ed in  binary  notation,  that  bit  position  which 
represents  the  most  significant  portion  of  the  number, 
or  the  sign  of  the  number. 


MPCR:  The  Microprogram  Count  Register  in  the  Interpreter. 


Multiprogramming:  A  general  computer  operating  environment 
in  which  more  than  one  program  at  a  time  is  executed 
with  each  given  a  fixed  time  slice. 


172 


Multiprocessing:  A  general  comouter  operating  environment  in 
which  two  or  more  central  processors  execute  simultane- 
ously* and  share  resources;  such  as,  memory  and  I/O 
dev  ices. 


Multiprocessor:  A  network  of  computers  capable  of  simultane- 
ously executing  two  or  more  programs  or  sequences  of 
instructions  by  means  of  multiprogramming,  parallel 
processing  or  both. 


Nanoi nst rue t i on :  A  single  instruction  stored  in  N-Memory  of 
the  Interpreter,  the  contents  of  which  constitue  56 
unique  signals  for  controlling  hardware  loqic  of  the 
Interpreter. 


Nanomemory  (N-Memory):  The  N-Memory,  one  of  the  five  func- 
tional units  of  the  Interpreter,  stores  56  specific  en- 
able signals  for  the  hardware  loqic  within  the  Logic 
Unit,  Control  Unit,  and  Memory  Control  Unit. 


Page: 


«  grouping  of  addresses  of  fixed  length.  In  the  Emu- 
lator the  AN/UYK-7  memory  was  treated  as  eight  pages  of 
8K  each  . 


PAR:  Program  Address  Register  in  the  AN/UYK-7. 


Program  Address  Register  (PAR):  A  register  in  the  AN/UYK-7 
which  holds  the  address  of  the  next  instruction  to  be 
accessed. 


Port  Select  Unit  (PSU):  The  PSU  orovides  control  and  the 
electrical  interface  between  a  single  Interpreter  and 
its  Devices  and  Data/Program  Memory. 


Shift  Amount  Register  (SAR):  The  SAR  is  a  6-bit  register  in 

the   Control   Unit   of   the   Interpreter  and  is  used  to 

store  the  number  of  positions  a  word  or  literal   is  to 
be  shifted  by  the  barrel  switch. 


Switch  Interlock  (SirtI):  The  S W I  provides  the  interconnection 
between  Interpreters,  Data/Program  Memory,  and  Devices 
of  an  Interpreter  Based  System.  Its  function  is  to 
permit  any  one  of  a  multiolicity  of  Interoreters  to  ac- 
cess all  modules  of  an  array  of  Data/Program  Memory 
and/or  all  Devices. 


173 


Target:  A  term  used  in  Emulation  to  define  a  machine   to   be 
emulated  (imitated).   In  this  thesis,  the  AN/UYK-7. 


TRAN SLANG:  A  computer  programming  language  designed  to  con- 
vert oseudo-Eng 1 i sh  language  statements  defining  the 
action  of  the  Interpreter  for  each  machine  cycle  into 
binary  patterns  for  the  M - Memories. 


Vertical:   A   mi c roorogrammi ng   instruction   which   controls 
those  gates  needed  for  a  single  function  execution. 


Z  Register  Section:  A  collection  of  registers  and  selection 
gates  in  the  Memory  Control  Unit  of  the  Interpreter, 
which  includes  the  CTR,  LIT,  and  Input  Selection  gates 
used  to  control  the  execution  sequence  of  m i c roi ns t rue- 
t  i  ons . 


17a 


BIBLIOGRAPHY 


1.  A  g  r  a  w  a  1  a  ,  A.  K.  and  R  a  u  s  h  e  r  ,  T.  G .  ,  "Microprogramming: 
Perspective  and  Status,"  IEEE  Trans,  C23,  p.  817-37, 
August  197a. 


2.   Allred,  G.  R.,  "System/370  Integrated  Emulation  Under  OS 
and  DOS,"  Proceedings  SJCC,  38,  p.  163-67,  1971. 


3.  Almes,  G.  T.,  Drongowski,  P.  J.,  and  Fuller,  S.  H., 
"tmulating  the  Nova  on  the  POP  11/40:  A  Case  Study," 
Computer  Conference,  p.  53-6,  Fall  1975. 


4 .   Bagley,  J.   D.,   "Microprogrammable   Virtual   Machines," 
Computer,  p.  38-42,  February  1976. 


5.   Boulaye,  G.  and  Mermet,   J.,   Microprogramming,   Herman, 
Paris,  1972. 


Briefer,  G.  8.,  "Taking  the  Risk  Out  of  System  Upgrad- 
ing," Data  Processinq  Magazine,  12,  d.  27-9,  Sep- 
tember 1970. 


Burrouah's  Corporation  Report  64116,  Emulation  Facility, 
by  Advanced  Design  Organization,  Paoli,  Pa.,  28  June 
1971. 


8.   Burrough's  Corporation  Report  TR70-2,   The   Interpreter, 
by  R.  L.  Davis,  16  February  1970. 


9.  Burrough's  Corporation  Report  TR70-8,  Microprogramming 
Manual  for  Interpreter  Based  Systems,  by  Advanced 
Design  Organization,  Paoli,  Pa.,  November  1970. 


10.  Burrough's  Corporation  Report  66143,  Algol  Reference 
Manual  for  the  Interpreter  Based  System,  by  Advanced 
Design  Organization,  Paoli,  Pa.,  15  June  1975. 


175 


11.  Dolhoff,  T.  L.,  "The  Negative  Aspects   of   Microprogram- 
ming," Datamation,  20,  p.  64-6,  July  1974. 


12.  E  1  1  e  n  b  y  ,  J.,  "Emulation  and  Competition   in   I/O   System 
Design,"  Computer  Conference,  o.  303-6,  1974. 


13.  Flynn,  M.  J.,  Neuhauser,  C,  and  McClure,  R.  M.,  "EMMY- 
An  Emulation  System  for  User  Microprogramming," 
Proceedings  NCC,  44,  p.  85-9,  1975. 


14.  Galey,  J.  M.,  "Microprogramming:  The  Bridge  Between 
Hardware  and  Software,"  Computer,  p.  23,  August 
1975. 


15.  Husson,  S.  S.,   Mi c roDroarammi ng   Principles   and   Prac- 
tices, Prentice-Hall,  Inc.,  1970. 


16.  Jaeger,  R.,  "Microprogramming:  A  General   Design   Tool," 
Computer  Design,  13,  o.  150-7,  August  1974. 


17.  Jones,  L.  H.,  "Instruction  Sequencing  in  Microprogrammed 
Computers,"  Proceedings  NCC,  44,  p.  91-8,  1975. 


18.  Jones,  L.,  "A  Survey  of  Current   work   in   Microprogram- 
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19.  Jones,  L.  H.  and  Merwin,  R.  E.,  "Trends  in  Microprogram- 
ming. A  Second  Reading,"  IEEE  Trans,  C23,  p.  754-9, 
August  1974. 


20.  Kahn,  P.  G.  and  Fuller,  M.  E.,  "Proaram  Conversion:  A 
Discussion  of  Techniques, "  Data  Processing  Magazine, 
11,  p.  28-31,  November  1969. 


21.  Mallach,  E.  G.,  "Emulator   Architecture,"   Computer,   p. 
24-32,  August  1975. 


176 


22.  Mandell,  R.  L.,  "Hardware/Software  Trade-Offs — Reasons 
and  Directions,"  Proceedinas  FJCC,  41,  o.  453-9, 
1972. 


23.  Rauscher,  T.  G.,  "On  the  Feasibility  of  Emulating  the 
AN/UYK-7  Computer  on  the  AAOC  Signal  Processing  Ele- 
ment/" NTIS,  November  1972. 


24.  Reigel,  E.  W.  V.  and  Fisher  D.  A.,  "The  In t erpret er--A 
Mi c poprogrammab 1 e  Building  Block  System,"  Proceed- 
ings SJCC,  ao,  p.   705-23,  1972. 


25.  Rosin,  R.  F.,  "Contemporay  Concepts  of  Microprogramming 
and  Emulation,"  Computer  Survey,  1,  p.  197-212,  De- 
cember 1969. 


26.  Sperry  Rand,  UNIVAC,  ComDuter  Set  AN/UYK-7  (V)  Technical 
Manual  Volume  1,  Navships  0967-319-40 1 0 ,  January 
1971. 


27.  Sperry  Rand,  UNIVAC,  AN/UYK-7,  Technical  Description. 


28.  Tucker,  A.  B.  and  Flynn,  M.  J.,  "Dynamic  Microprogram' 
ming:  Processor  Organization  and  Programming,"  Com' 
munications  of  the  ACM,  14,  p.  240-50,  April  1971. 


29.  Wilkes,  M.  B.  "The  Growth  of  Interest   in   Microprogram' 
ming:   A   Literature  Survey,"  Computer  Survey,  1,  p 
139-45,  September  1969. 


177 


INITIAL  DISTRIBUTION 


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Alexandria/  Virginia,  22314 


No.  Copi  es 
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Naval  Postgraduate  School 
Monterey,  California  93940 

3.  Department  Chairman,  Code  52 
Computer  Science  Group 
Naval  Postgraduate  School 
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4.  Professor  S.  Jauregui,  Code  62JA 
(Thesis  Adv  isor) 

Department  of  Electrical  Engineering 
Naval  Postgraduate  School 
Monterey,  California  93940 


5.  LT.  Lyle  V.  Rich,  Code  52RS 
(Second  Reader) 

Department  of  Computer  Science 
Naval  Postgraduate  School 
Monterey,  California  93940 


6.  Mr .  J .  Lynch 
Bur  rough ' s  ADO 

Federal  and  Special  Systems  Group 
P.O.  BOX  517 
Paoli,  Pa.     19301 


7 .  Mr  Carl  Benson 

Naval  Electronics  Systems  Engineering  Center 

P.  0.  Box  80337 

San  Diego,  California   92138 


178 


8.  Mr.  J.  Lopata 

Burrough's  Corporation 
P.  0.  Box  517 
Paoli,  Pa.  19301 


9.  Lt.  Jerry  M.  Haggerty 
103  Moran  Circle 
Monterey,  California  93940 


10.  Lt.  John  M.  Hartling 
376  A .  Bergi  n  Drive 
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11.  Naval  Electronics  Systems  Command 
Code  PME  107 

Washington,  D.  C.   20360 
Attn:   CAPT  W.  Flowers 


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Washington,  D.  C.   20360 
Attn:   CAPT  H.  Leavitt 


179 


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DUDLEY  KNOX  LIBRARY 


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